"Even Catholics admit it: Rome changed God's Sabbath to Sunday, just as Daniel foretold." It is a common Adventist charge, and it deserves a careful, historical answer.
Short answer: No pope, council, or emperor invented Sunday worship. Christians gathered on "the first day of the week" in the New Testament itself, and second-century writers describe Sunday as the Christian day of assembly, long before Constantine. When Catholic writers say the Church "transferred" the day, the Church's own teaching traces that to the apostles, acting with authority from Christ.
Key verses on the first day of the week
- "After the sabbath, as the first day of the week was dawning" (Matthew 28:1)
- "On the evening of that first day of the week... Jesus came and stood in their midst" (John 20:19)
- "On the first day of the week when we gathered to break bread" (Acts 20:7)
- "On the first day of the week each of you should set aside and save" (1 Corinthians 16:2)
- "I was caught up in spirit on the Lord's day" (Revelation 1:10)
Scripture quotations are from the New American Bible, Revised Edition (NABRE), © 2010, 1991, 1986, 1970 Confraternity of Christian Doctrine, Washington, D.C. Used by permission. All rights reserved.
What Catholics Actually Teach
The Adventist view first. The Seventh-day Adventist Church's official beliefs state: "The fourth commandment of God's unchangeable law requires the observance of this seventh-day Sabbath as the day of rest, worship, and ministry in harmony with the teaching and practice of Jesus, the Lord of the Sabbath" (Fundamental Belief 20). The same page adds: "Nowhere in the Bible does it say the Sabbath day was changed."
The Catholic Church answers that Sunday comes from the apostles: "By a tradition handed down from the apostles which took its origin from the very day of Christ's Resurrection, the Church celebrates the Paschal mystery every seventh day, which day is appropriately called the Lord's Day or Sunday" (CCC 1166). Sunday is celebrated "in light of the apostolic tradition" (CCC 2177). The commandment's moral core remains: to give God "an outward, visible, public, and regular worship" (CCC 2176).
Notice two levels. The Lord's Day itself is apostolic tradition. The precise duty to attend Mass is Church law: "The precept of the Church specifies the law of the Lord more precisely" (CCC 2180).
What Catholics do not teach:
- That a pope can rewrite God's moral law. The duty of regular public worship binds everyone (CCC 2176).
- That Constantine created Sunday worship, or the Church. (See Did Constantine Create the Catholic Church?)
- That Adventists act in bad faith. Their zeal for God's commandments is real.
The Biblical Case
1. The Resurrection fell on the first day
The women came "After the sabbath, as the first day of the week was dawning" (Matthew 28:1). The risen Jesus appeared to the disciples "On the evening of that first day of the week" (John 20:19), and again "a week later" (John 20:26).
2. The apostolic Church gathered on the first day
In Troas, St. Paul's company "spent a week" (Acts 20:6), yet the assembly came on a set day: "On the first day of the week when we gathered to break bread, Paul spoke to them" (Acts 20:7). The NABRE note calls the first day "the day after the sabbath," "apparently chosen originally by the Jerusalem community for the celebration of the liturgy of the Eucharist in order to relate it to the resurrection of Christ." St. Paul told Corinth to set aside its collection "On the first day of the week," as he had "ordered the churches of Galatia" (1 Corinthians 16:1–2).
3. St. John gives the day a new name
"I was caught up in spirit on the Lord's day" (Revelation 1:10). The NABRE note says simply: "The Lord's day: Sunday." The earliest Christian writings use this name for the weekly assembly (see below).
4. The apostles handed on traditions, not only letters
St. Paul wrote: "stand firm and hold fast to the traditions that you were taught, either by an oral statement or by a letter of ours" (2 Thessalonians 2:15). Sunday is such a tradition: visible in Scripture's practice, confirmed by the next generation. For the wider biblical case, see Should Christians Worship on Saturday or Sunday?
Objections Answered
(a) "Daniel foretold a power that would change the times and the law."
At its strongest: Adventist.org quotes Daniel 7:25 in the King James wording, "shall think to change the times and the law," and states: "This change of the Sabbath was foretold in the Bible by the prophet Daniel." The General Conference's Adult Bible Study Guide counts "the change of the Sabbath commandment to Sunday" among the "changes of the 'times and law' introduced by the papacy."
Answer: In the NABRE the horn is "intending to change the feast days and the law" (Daniel 7:25). The NABRE note explains: "The reference is to the persecution of Antiochus IV and specifically to the disruption of the Temple cult (1 Mc 1:41–64)." Antiochus ordered the Jews "to profane the sabbaths and feast days" (1 Maccabees 1:45). And if meeting on the first day fulfilled Daniel 7:25, the guilty party would be the apostles, who were already doing it (Acts 20:7).
(b) "Acts 20:7 was a one-time Saturday-night farewell, and 1 Corinthians 16:2 is savings at home."
At its strongest: By Jewish reckoning the first day began at sunset on Saturday, so the Troas meeting, which ran "until midnight" (Acts 20:7) with "many lamps" (20:8), was a Saturday-night farewell before St. Paul left "on the next day." Nothing makes it a weekly service. And in 1 Corinthians 16:2 each person sets money aside privately, not at an assembly. Adventist.org stresses that "there was no command in Scripture" to keep Sunday.
Answer: Grant the Jewish reckoning; it changes nothing. Saturday evening by that count is already the first day, the day after the sabbath. St. Luke does not say the believers gathered because St. Paul was leaving. He says they gathered "to break bread": the purpose of the assembly is the Eucharist, and St. Paul's sermon is the occasion. He had waited "a week" in Troas (20:6), passing a sabbath there, yet the breaking of bread came on the first day (20:11). In 1 Corinthians 16:1–2, St. Paul fixes the same day for "the churches of Galatia" and Corinth alike, a weekly rhythm across churches, "so that collections will not be going on when I come." And St. John names the day itself: "the Lord's day" (Revelation 1:10).
Then the earliest Christians remove all doubt. The Didache: "every Lord's day gather yourselves together, and break bread." St. Justin Martyr: "on the day called Sunday, all who live in cities or in the country gather together to one place." The Letter of Barnabas: "we keep the eighth day with joyfulness, the day also on which Jesus rose again from the dead." A one-time farewell does not become the universal custom of the Church within a lifetime. The apostolic practice does.
(c) "Even Catholics admit the Church changed it."
At its strongest: Cardinal James Gibbons wrote that you may read the Bible from Genesis to Revelation without finding a single line authorizing the sanctification of Sunday, and that the Scriptures enforce the religious observance of Saturday, a day Catholics never sanctify (The Faith of Our Fathers, ch. 8). The Catechism of the Council of Trent says the Church of God in her wisdom ordained that the celebration of the Sabbath be transferred to the Lord's day.
Answer: These statements are real, and Catholics should own them. But read them in context. Gibbons was arguing against "the Bible alone": no verse commands the switch, so Sunday-keepers already rely on Tradition. His next sentence credits our Lord and His Apostles. The Trent Catechism likewise says the Apostles resolved to consecrate the first day of the week to divine worship. In these texts, "the Church" includes the apostles. Gibbons did overstate: Scripture records the first-day practice (Acts 20:7; 1 Corinthians 16:2), even without an explicit command.
(d) "Constantine changed the day in AD 321."
At its strongest: Adventist.org states: "The change of the Sabbath as the day of worship from Saturday to Sunday happened in the year 321 A.D." and "The Roman Emperor Constantine issued a decree that all Christians were to begin observing Sunday as a day of rest."
Answer: Look at what the decree did. Constantine's law of March 7, 321 (preserved in the Code of Justinian) ordered city officials, townspeople, and workshops to rest on the day of the sun, while letting farmers keep working. It regulated civil rest. Christians had already worshiped on Sunday for well over two centuries. Eusebius says Constantine honored "the day of our Lord and Saviour" (Life of Constantine 4.18), an existing Christian day. And Constantine was an emperor, not a pope.
The Early Church Agrees
- The Didache (late first or early second century): "But every Lord's day gather yourselves together, and break bread, and give thanksgiving after having confessed your transgressions, that your sacrifice may be pure" (ch. 14).
- St. Ignatius of Antioch (Letter to the Magnesians, c. AD 107) describes believers "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" (ch. 9).
- The Letter of Barnabas (probably early second century): "we keep the eighth day with joyfulness, the day also on which Jesus rose again from the dead" (ch. 15).
- St. Justin Martyr (First Apology, Rome, c. AD 155): "And on the day called Sunday, all who live in cities or in the country gather together to one place" ... "But Sunday is the day on which we all hold our common assembly, because it is the first day on which God, having wrought a change in the darkness and matter, made the world; and Jesus Christ our Saviour on the same day rose from the dead" (ch. 67).
A note on St. Ignatius, since some scholars raise it: his Greek reads literally "living according to the Lord's [...]," with the noun left to be supplied. Translators supply "Day" because the phrase stands in direct contrast to "observing the Sabbath" and is tied to the day "on which also our life has sprung up again." Even read another way, St. Ignatius still says Christians are "no longer observing the Sabbath." And the Didache, Barnabas and St. Justin need no supplied word at all.
These witnesses, from Syria to Rome, all wrote more than a century and a half before Constantine's law.
Conclusion
Adventists are right that no human authority may overturn God's law. The question is historical: is Sunday a late corruption, or the practice of the apostles? The New Testament and the earliest Christians answer with one voice. The Church did not move the Lord's Day in the fourth century. She received it in the first.
If you keep the seventh day out of love for God, we honor that love. Read Acts 20, the Didache, and St. Justin side by side, and ask who first called Sunday "the Lord's day."
Come home. The Lord's Day that the apostles kept on the first day of the week is still kept, every Sunday, in the Catholic Church. Christ promised, "upon this rock I will build my church" (Matthew 16:18), and His Church never fell away or disappeared. It is the Catholic Church, governed by the successor of St. Peter and the bishops in communion with him. "It is through Christ's Catholic Church alone, which is the universal help toward salvation, that the fullness of the means of salvation can be obtained" (CCC 816). We invite you to come and see the Church Christ founded, and to enter her.
Your next step: Come to Mass this Sunday at your local Catholic church. You can find one near you at MassTimes.org. Everyone is welcome; if you're not yet Catholic, pray with us but don't receive Communion yet. When you're ready to become Catholic, call the parish office and ask about OCIA, the Order of Christian Initiation of Adults. They will walk you through every step. Read our guide: How Do I Become Catholic? Not ready yet? Get our free pocket guide below and keep learning.
FAQ
Did a Church council ever forbid Saturday rest? A regional one did, long after Sunday worship began. The fourth-century Synod of Laodicea ruled: "Christians must not judaize by resting on the Sabbath, but must work on that day, rather honouring the Lord's Day" (canon 29). It regulated rest, not the origin of Sunday worship.
Must Catholics attend Mass every Sunday? Yes, "unless excused for a serious reason (for example, illness, the care of infants) or dispensed by their own pastor"; "Those who deliberately fail in this obligation commit a grave sin" (CCC 2181).
Does a Saturday Mass count? Only a Saturday evening Mass. The precept is met by a Mass "either on the holy day or on the evening of the preceding day" (CCC 2180).
Sources
Scripture (NABRE, bible.usccb.org): Daniel 7:25 (with NABRE note); 1 Maccabees 1:45; Matthew 16:18; Matthew 28:1; John 20:19, 26; Acts 20:6–8, 11 (with NABRE note on 20:7); 1 Corinthians 16:1–2; 2 Thessalonians 2:15; Revelation 1:10 (with NABRE note).
Other translation (quoted only to state the objection as adventist.org gives it): King James Version, Daniel 7:25.
Catechism of the Catholic Church (vatican.va): 816; 1166; 2176, 2177, 2180, 2181.
Church Fathers (newadvent.org): Didache 14 (ANF vol. 7); St. Ignatius of Antioch, Letter to the Magnesians 9 (ANF vol. 1); Letter of Barnabas 15 (ANF vol. 1); St. Justin Martyr, First Apology 67 (ANF vol. 1, ccel.org); Eusebius, Life of Constantine 4.18 (NPNF2 vol. 1); Synod of Laodicea, canon 29 (NPNF2 vol. 14).
Other Catholic sources: James Cardinal Gibbons, The Faith of Our Fathers, ch. 8 (93rd ed., 1917, Project Gutenberg); Catechism of the Council of Trent, Part III, "The Third Commandment" (tr. J. Donovan, 1829, Wikisource).
Seventh-day Adventist sources: "What Is the Sabbath" and Fundamental Belief 20 (adventist.org); General Conference Adult Sabbath School Bible Study Guide, Daniel (1st quarter 2020), Lesson 8 (web version published by permission of the General Conference).
History: Constantine's Sunday law of March 7, 321, preserved in the Code of Justinian, book 3, title 12 (paraphrased).