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“Upon the first day of the week when the disciples came together to break bread” (Acts 20:7).

Jhn 20:1 ¶ The first [day] of the week cometh Mary Magdalene early, when it was yet dark, unto the sepulchre, and seeth the stone taken away from the sepulchre.

Jhn 20:19 ¶ Then the same day at evening, being the first [day] of the week, when the doors were shut where the disciples were assembled for fear of the Jews, came Jesus and stood in the midst, and saith unto them, Peace [be] unto you.

The prophesy of pentecost places it on a Sunday: Lev 23:16 Even unto the morrow after the seventh sabbath shall ye number fifty days; and ye shall offer a new meat offering unto the LORD.

Act 20:7 ¶ And upon the first [day] of the week, when the disciples came together to break bread, Paul preached unto them, ready to depart on the morrow; and continued his speech until midnight.

1Cr 16:2 Upon the first [day] of the week let every one of you lay by him in store, as [God] hath prospered him, that there be no gatherings when I come.

Ignatius 110 A.D. wrote in his epistle to the Magnesians 9…” If they who were concerned in old things, arrived at a newness of hope, no longer observing the Sabbath, but living according to the Lord’s day, by which our life sprung from him and by his death (whom certain persons deny)…we have been made his disciples, let us live according to Christianity.”

Barnabas 120A..D. “Wherefore, also, we keep the eighth day with joyfulness, the day, also, on which Jesus rose again from the dead”

Justin Martyr 140 A..D. “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, made the world; and Jesus Christ our savior , on the same day rose from the dead.”

Didache 80-90 A.D. “And on the day of our lords resurrection, which is the Lord’s day meet more diligently.”