Act 20:7 | CPDV | STEP | Then, on the first Sabbath, when we had assembled together to break bread, Paul discoursed with them, intending to set out the next day. But he prolonged his sermon into the middle of the night. The expression “first Sabbath” refers to Easter Sunday, the commemoration of the first Christian Sabbath. In the year in question, Easter Sunday was celebrated some 12 (5 + 7) days or more after “the days of Unleavened Bread”, which refers to Passover. It is unclear how Easter Sunday was calculated at that early time in the Church, but it did not always coincide with Passover.

Acts 20:7

7 Then, on the first Sabbath, when we had assembled together to break bread, Paul discoursed with them, intending to set out the next day. But he prolonged his sermon into the middle of the night. The expression “first Sabbath” refers to Easter Sunday, the commemoration of the first Christian Sabbath. In the year in question, Easter Sunday was celebrated some 12 (5 + 7) days or more after “the days of Unleavened Bread”, which refers to Passover. It is unclear how Easter Sunday was calculated at that early time in the Church, but it did not always coincide with Passover. ^{▼▼20:7 And on the first day of the week: Here St. Chrysostom and many other interpreters of the scripture explain, that the Christians even at this time, must have changed the sabbath into the first day of the week, (the Lord’s day,) as all Christians now keep it. This change was undoubtedly made by the authority of the church; hence the exercise of the power, which Christ had given to her: for he is Lord of the sabbath.(Challoner)}