Too much confusion is made out of a what should be a simple exegesis of Scripture.

The concept of time measurement is important in understanding what the Scripture is actually saying.

The Passover lamb was slaughtered in the Temple Compound as a sacrifice in the morning on the first day of Passover. The Jewish day begins at sunset. The Jewish system of time has the first night preceding the first day.

Matt 28:1 “Now after the Sabbath, as the first day of the week began to dawn, Mary Magdalene and the other Mary came to see the tomb.”

Mark 16:2 “Very early in the morning, on the first day of the week, they came to the tomb when the sun had risen.”

On the first day, (much like it states on the third day Jesus rose from the dead)

First 3391 mia irregular feminine of 1520; one or first:

Week 4521 sabbaton of Hebrew origin [7676]; the Sabbath (i.e. Shabbath), or day of weekly repose from secular avocations (also the observance or institution itself); by extension, a se'nnight, i.e. the interval between two Sabbaths; likewise the plural in all the above applications:

A week was measured from Sabbath to Sabbath. This was initiated by the Lord from creation, Gen. 1:5So the evening and the morning were the first day. “ a day begins at evening time.

Luke 24:1-2 “Now on the first day of the week, very early in the morning, they, and certain other women with them, came to the tomb bringing the spices which they had prepared But they found the stone rolled away from the tomb.” (First 3391 mia (mee'-ah)

irregular feminine of 1520; one or first:

Week 4521 sabbaton

Same words are in John 20:1 “On the first day of the week Mary Magdalene went to the tomb early, while it was still dark, and saw that the stone had been taken away from the tomb.” Why is it dark? This next day did not begin at sunrise, nor 12:00, but the prior evening.

John 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, Jesus came and stood in the midst, and said to them, "Peace be with you." In other words (at evening) before the next day officially commenced.

3391 mia. irregular feminine of 1520; one or first: The word day is not in the text but it is the first in the week.

Matthew explains in more detail how it took place 28:1-2 Now after the Sabbath, as the first day of the week began to dawn, Mary Magdalene and the other Mary came to see the tomb. And behold, there was a great earthquake; for an angel of the Lord descended from heaven, and came and rolled back the stone from the door, and sat on it.

Mark 16:2 “Very early in the morning, on the first day of the week, they came to the tomb when the sun had risen.” V.9 Now when He rose early on the first day of the week”

4413 protos contracted superlative of 4253; foremost (in time, place, order or importance): KJV-- before, beginning, best, chief (-est), first (of all), former.

Each tell us the first day of the week not the Sabbath (which is the seventh day), but after the day of rest. The day after the Sabbath is Sunday - the first day of the week. The Feast of First-fruits is on the first Sunday after the Passover.

Scripture states “the first day of the week,” is what we call Sunday. But the word “Sunday” is never used in the Bible (Sunday is of a pagan origin and so is the word Saturday). It is by Church tradition “the Lord's Day,” is applied to Sunday (it is the only used once in Scripture). The Bible does not call Sunday “the Lord's Day,” nor is it called “the Sabbath”. The title given is the first day of the week. So to say Sunday is the new Sabbath is wrong.

The church began by the Holy Spirit being sent, the gospel being preached and 3,000 Jews were baptized on the first day (Acts 2:1, 41). Sunday became the day to gather and celebrate the new covenant where Jesus rose from the dead (Acts 20:7; 1Cor.16:2 these days relate to the event).