Hebrews 8:13: “In speaking of a new covenant, he makes the first one obsolete.”

“Finally, He says to them: ‘Your new moons and your Sabbaths I cannot endure.’ You see what He means: it is not the present Sabbaths that are acceptable to Me, but the one which I have made, when, giving rest to all things, I shall make the beginning of an eighth day, that is, the beginning of another world.

Wherefore also we keep the eighth day with joyfulness, the day on which Jesus rose from the dead, and after He had appeared, ascended into the heavens.”

Epistle of Barnabas 15:8–9 (Ante-Nicene Fathers [ANF], Vol. 1, p. 147).

Why Christians Worship on Sunday Instead of Saturday

From a Christian viewpoint, the shift from worshiping on Saturday (the Jewish Sabbath) to Sunday (Christian Lord’s Day) is a profound theological and historical development rooted in the New Testament, early Church tradition, and the fulfillment of the Old Covenant in Christ.

Today, I’ll explore why Christians do not communal worship on Saturday but instead on Sunday, drawing on Sacred Scripture—particularly the New Testament—and the writings of early Church Fathers like Ignatius of Antioch and the author of the Epistle of Barnabas. We now belong to the New Testament and the New Creation in the New Adam, who is Jesus Christ.

Christ’s Resurrection and the Lord’s Day

The New Testament provides the foundational basis for Sunday worship, emphasizing Christ’s resurrection as the defining event that transforms the rhythm of Christian life. In the Gospel of Matthew, Jesus rises on “the first day of the week” (Matthew 28:1), which corresponds to Sunday in the Jewish reckoning of days beginning at sundown. Similarly, Mark 16:2 states, “And very early on the first day of the week, when the sun had risen, they went to the tomb,” and Luke 24:1 echoes, “But on the first day of the week, at early dawn, they went to the tomb.” John 20:1 reinforces this: “Now on the first day of the week Mary Magdalene came to the tomb early.” This consistent testimony across the Gospels identifies Sunday as the day of Christ’s triumph over death, a pivotal moment that Catholics see as inaugurating a new creation.

New Testament Witness

This resurrection significance extends to early Christian practice. Acts 20:7 records, “On the first day of the week, when we were gathered together to break bread, Paul talked with them.” The phrase “break bread” is widely understood in Catholic tradition as a reference to the Eucharist, the central act of worship. This gathering on Sunday reveals a shift from the Jewish Sabbath (Saturday) to a new day of Eucharistic worship tied to Christ’s rising. Likewise, 1 Corinthians 16:2 advises, “On the first day of every week, each of you is to put something aside and store it up,” indicating a regular Sunday collection during worship, further evidencing its liturgical prominence.

Revelation 1:10 adds a theological layer: “I was in the Spirit on the Lord’s Day.” Though not explicitly cited as “Sunday,” early Christians interpreted “the Lord’s Day” (kyriakē hēmera) as the first day of the week, commemorating Christ’s resurrection. The Didache (c. AD 70–120) and later Fathers confirm this usage. Thus, the New Testament establishes Sunday as the day when Christians gathered to celebrate the Eucharist and honor Christ’s victory, distinguishing it from the Jewish Sabbath.

Fulfillment of the Sabbath in Christ

The New Testament views the Sabbath—a commandment to rest on the seventh day (Exodus 20:8–11)—as part of the old creation and old covenant, fulfilled and transformed by Christ in the New Covenant.

Colossians 2:16–17 states, “Therefore let no one pass judgment on you in questions of food and drink, or with regard to a festival or a new moon or a Sabbath. These are a shadow of the things to come, but the substance belongs to Christ.” Paul here identifies the Sabbath as a “shadow,” a prefigurement of the spiritual rest found in Christ, not a perpetual obligation for Christians.

Hebrews 4:9–10 deepens this: “So then, there remains a Sabbath rest for the people of God, for whoever has entered God’s rest has also rested from his works as God did from his.” This “Sabbath rest” is eschatological, realized in Christ’s redemptive work, not tied to a specific day.

The Council of Jerusalem (Acts 15) further supports this shift. When debating whether Gentile converts must follow Mosaic Law, the apostles, led by Peter, ruled that only minimal requirements (e.g., abstaining from idolatry and immorality) were necessary, omitting Sabbath observance (Acts 15:28–29). This decision, authoritative for Christians, signals that the ceremonial laws, including the Saturday Sabbath, do not bind Christians.

Early Church Fathers: Ignatius of Antioch

Ignatius of Antioch (d. c. AD 108), a disciple of the Apostle John, provides early testimony to the abandonment of Saturday worship in favor of Sunday. In his Epistle to the Magnesians 9:1, he writes,

“If, therefore, those who were brought up in the ancient order of things have come to the possession of a new hope, no longer observing the Sabbath, but living in the observance of the Lord’s Day, on which also our life has sprung up again by Him and by His death—whom some deny… how shall we be able to live apart from Him?” (ANF, Vol. 1, p. 62).

Ignatius contrasts the Jewish Sabbath with the Lord’s Day (Sunday), linking the latter to Christ’s resurrection as the source of new life. His phrase “no longer observing the Sabbath” explicitly rejects Saturday worship for Christians, emphasizing a theological shift rooted in Easter.
Ignatius’ context is anti-Judaizing: he warns against Christians reverting to Jewish practices, which he sees as denying Christ’s grace (Magnesians 8:1: “If we still live according to the Jewish law, we acknowledge that we have not received grace”). For Christians, Ignatius’ witness, as an Apostolic Father, carries weight, reflecting apostolic tradition that Sunday supplants Saturday as the day of worship.

Early Church Fathers: Epistle of Barnabas

The Epistle of Barnabas (c. AD 70–132), though not canonical, offers a sharp critique of literal Sabbath-keeping, reinforcing the Catholic view. In Barnabas 15:8–9, the author declares,

“Finally, He says to them: ‘Your new moons and your Sabbaths I cannot endure.’ You see what He means: it is not the present Sabbaths that are acceptable to Me, but the one which I have made, when, giving rest to all things, I shall make the beginning of an eighth day, that is, the beginning of another world. Wherefore also we keep the eighth day with joyfulness, the day on which Jesus rose from the dead” (ANF, Vol. 1, p. 147).

Citing Isaiah 1:13, the author argues that God rejects the Jewish Sabbath, reinterpreting it as an eschatological rest fulfilled in Christ. The “eighth day” (Sunday, following the seventh-day Sabbath) symbolizes this new era, aligning with resurrection theology.

Christians observe this as evidence of an early Christian consensus that Saturday worship is obsolete, replaced by Sunday’s celebration of the “new world” begun in Christ. While Barnabas is polemical and not magisterial, its influence on early theology underscores the shift away from Judaizing practices.

Theological Rationale: Sunday as the Day of the New Creation

Christian doctrine ties Sunday worship to the concept of a “new creation.” Just as God rested on the seventh day after creating the world (Genesis 2:2–3), Christ’s resurrection on the first day marks the renewal of a new creation. Christ fulfills the Sabbath’s purpose—rest and communion with God—in a new context, as Christ’s victory over sin and death (Romans 6:4) surpasses the old order.

The Church Fathers amplify this. Ignatius’ “life has sprung up again” (Magnesians 9) and Barnabas’ “beginning of another world” (15:8) echo 2 Corinthians 5:17: “If anyone is in Christ, he is a new creation.” Sunday thus becomes the day when Catholics celebrate this renewal through the Mass, which re-presents Christ’s sacrifice and resurrection.

Traditional Witness and Authority

Historically, Christian Sunday communal worship emerged early, as seen in Acts 20:7 and 1 Corinthians 16:2, and was codified by Church authority. The Council of Laodicea (c. AD 363–364), Canon 29, later declared, “Christians must not judaize by resting on the Sabbath, but must work on that day… preferring in honor the Lord’s Day” (NPNF, Series 2, Vol. 14, p. 148). This reflects a Catholic reliance on apostolic tradition and the Magisterium to interpret Scripture, per 2 Thessalonians 2:15: “Stand firm and hold to the traditions that you were taught by us.”

Conclusion for Christians

Christians worship on Sunday, not Saturday, because the New Testament establishes it as the day of Christ’s resurrection (Matthew 28:1, Acts 20:7), fulfilling the Sabbath’s shadow (Colossians 2:16–17) in a New Covenant of grace (Acts 15). Fathers such as Ignatius of Antioch confirm this shift, rejecting Sabbath observance for the Lord’s Day (Magnesians 9:1), while Barnabas redefines rest as an eschatological reality celebrated on the “eighth day” (15:8–9). Theologically, Sunday honors the new creation in Christ, a truth the Catholic Church, guided by apostolic authority, has upheld since the resurrection of Christ. For Christians, this is not a rejection of the Sabbath’s sanctity but its transformation into a higher celebration of redemption, lived out each Sunday in the Eucharist.

Are you interested in going deeper? Please sign up for my online Theology course at: nsti.com.

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As one who connects the Old Testament features to Catholic dogma (see this book: The Crucified Rabbi), I’ve always been painfully aware that the term “apostle” doesn’t have a slick connection to Old Testament kingdom language.

Pagan “Boat” Sources for the Term Apostle:

In pagan Greek sources (such as in the writings of the Greek historian Herodotus), ἀπόστολος (apostolos) refers to a political or military delegate or messenger. ἀπόστολος also refers to the commander of a naval force.

In fact, στόλος refers to a naval division or to a colony. So an ἀπόστολος is one who travels out to these naval colonies. Sometimes ἀπόστολος is used to refer to a formal naval dispatch or to an export license to/from these colonies.

So when the New Testament authors adopt this Greek term, they are not merely referring to a local rabbi or preacher. They are using a term that referred to diplomats who traveled to the farrest ends of the earth. It’s a global or catholic term.

Pauline Sources for the Term:

The term ἀπόστολος appears only once in the Greet Septuagint (Greek version of Old Testament) at 1 Kings 14:6 where ἀπόστολος is a translation of the Hebrew שָׁלוּחַ (sha-lach). The term appears 79 times in the New Testament – 68 of which are found in the writings of Paul and his disciple Luke.

It seems that originally ἀπόστολος referred to each of the original Twelve Apostles. However, Saint Paul opened the term to include himself, Barnabas (Acts 14:14) and Timothy and Silvanus (1 Thessalonians 2:7). Paul also speaks of false apostles in 2 Corinthians.

In Hebrews, Luke/Paul identify Jesus as “the apostle and high priest of our confession” (Heb 3:1). In this context, apostleship is associated with the high priesthood. This is our biggest hint into how early Christians understood the term ἀπόστολος. It was missionary and priestly. Just as an ἀπόστολος origianlly referred to naval delegates to colonies, so a high priest bridges over water as a pontifex, a bridge builder between God and man.

According to Paul, apostles surpass the various other offices within the Church of “teachers, evangelists, and prophets” (διδάσκαλος, εὐαγγελιστής, προφήτης). In the mind of Paul, an apostle is more than these three. I would argue, that for Paul an apostle is all three of these at once while also being priestly diplomats for Christ.

Are Apostles Political or Priestly?

At first glance into a Greek dictionary, the term ἀπόστολος seems political or mercantile. It’s a civil title. However, the Christians looked to King Melchizedek and King David as “priest kings” or “liturgical kings” as the prototypes for King Jesus. So the political realm collapses into the priestly liturgical realm. This is why Christ is both establishing a “kingdom” (political) and also building at “temple” (priestly). He is king and pontiff. And so also, his political ministers are both political and cultic. The ἀπόστολος is a naval delegate for foreign colonies throughout the world but he is also a sacrificial priest who offers the Gentiles to God as sacrifice and who offers the Eucharist as sacrifice.

Apostles on a Boat:

One final related topic. I couldn’t help but noticed that in Acts, the vivid scenes of Paul traveling by ship may in fact be intentionally recounted with detail to bolster Paul’s identity as ἀπόστολος. In the Greek mind, the ἀπόστολος is primarily naval and thus Paul is literally fulfilling his role as ἀπόστολος (maybe better so than the Twelve!). Also, the stories of Saint James Zebedee going to and from (posthumously) to Spain by boat ratifies James as a true apostle for Jesus. And let’s not forget all the “Jesus in a boat” scenes from the Gospels!

[reminder]

The post What is an Apostle? (And How it Relates to all the Boat Scenes in the Bible) appeared first on Taylor Marshall.

30 Then Eli′jah said to all the people, “Come near to me”; and all the people came near to him. And he repaired the altar of the Lord that had been thrown down; 31 Eli′jah took twelve stones [prefigures the 12 Apostles], according to the number of the tribes of the sons of Jacob, to whom the word of the Lord came, saying, “Israel shall be your name”; 32 and with the stones he built an altar in the name of the Lord. And he made a trench about the altar, as great as would contain two measures of seed [2 measures of seed comes again with Elisha as a prophetic sign in 2 Kings 7]. 33 And he put the wood in order, and cut the bull in pieces and laid it on the wood. And he said, “Fill four jars with water, and pour it on the burnt offering, and on the wood.” 34 And he said, “Do it a second time”; and they did it a second time. And he said, “Do it a third time”; and they did it a third time [triple pouring on the sacrifice with water – as a kind of baptism]. 35 And the water ran round about the altar, and filled the trench also with water.

36 And at the time of the offering of the oblation, Elijah the prophet came near and said, “O Lord, God of Abraham, Isaac, and Israel, let it be known this day that thou art God in Israel, and that I am thy servant, and that I have done all these things at thy word. 37 Answer me, O Lord, answer me, that this people may know that thou, O Lord, art God, and that thou hast turned their hearts back.” 38 Then the fire of the Lord fell, and consumed the burnt offering, and the wood, and the stones, and the dust, and licked up the water that was in the trench. [here we have a prefigurement of Pentecost with the fire coming down from Heaven upon the “baptized sacrifice”] 39 And when all the people saw it, they fell on their faces; and they said, “The Lord, he is God; the Lord, he is God.” 40 And Elijah said to them, “Seize the prophets of Ba′al; let not one of them escape.” And they seized them; and Elijah brought them down to the brook Kishon, and killed them there.

The Church East and West conforms to a triple affusion (pouring) or triple immersion (dunking) with the recognition of the three Divine Persons of the Trinity. Prophetically, Elijah has the attendants pour water on the slaughtered sacrifice three times. It’s also no accident that Saint John the Baptist was the “new Elijah” teaching a new baptism.

Elijah poured water on the sacrifice to show that God’s fire is so hot and powerful that water cannot prevent it from burning the sacrifice.

I recently spoke of the life of the follower of Jesus as “being on sacrificial fire” (click here to read “Do you have fire in your soul?”). You may also want to listen to my presentation on on the apocryphal 1 Enoch and Tongues of fire here.

There is a connection between the mystery of water (baptism in Christ) and the mystery of fire (confirmation or chrismation in Christ), as Saint John the Baptist relates in his speaking of baptism by water and fire.

We do this every day. We wash our food and then we place it in the fire. When you slaughter animals, you wash the meat and then cook it. The many mikvehs of the Old Covenant were washings to prepare the believer for becoming a burnt sacrifice for God.

Hence, Christ’s baptism is a preparation for His burnt sacrifice (crucifixion, resurrection, ascension, pentecost).

The priest washes his hands ceremonially because his hands are about to hold the burning coal of the sacrificial body of Christ.

In the Solemn High Mass (pre 1970), the priest sprinkled the faithful in the pews – to prepare them to become a burning sacrifice.

And of course, we will all be “salted with fire” when we die. It’s just a matter of whether we burn in this life (as sacrificial love) or burn some in the next age (in the purgatorial fires of 1 Cor 3:15).

Make your life into a bonfire.

Godspeed,

Taylor

PS: If you want to learn more about Old Testament and Jewish origins of Catholic sacraments and Catholic theology, check out my book The Crucified Rabbi: Judaism and the Origins of Catholicism.

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