Passover is a feast of the LORD, not a feast of Israel or the Jews! He instituted it and commands us to keep it.
Earl L. Henn (1934-1997)
Holy Days: Passover
Historically, the church of God has observed the Passover just after sunset as the 14th day of Abib begins, as commanded in Exodus 12:1-14 (see also Leviticus 23:4-5; Numbers 9:2-5). However, it is also plain from Scripture that Jesus Christ was not sacrificed at that time—His trial and crucifixion took place during the daylight portion of the 14th, and He died around 3:00 pm on the preparation day for the first day of Unleavened Bread (Matthew 27:45-50; Mark 15:33-37; Luke 23:44-46; John 19:30-31). Since He is our Passover (I Corinthians 5:7), why did His death not occur at the time the Passover lambs were to be slain—at the beginning of the 14th day? Or should His death set the standard for understanding the instructions given to Israel?
To add to the complexity, the gospel accounts show Jesus observing the Passover with His disciples at the beginning of the 14th. Which of His actions should we use as our guide for observing Passover: the time when He observed it or when He died? And why are those events at different times?
When the time of Jesus' death is chosen above all else, the typical result is a change in the observance of Passover from the beginning of the 14th day of Abib, just after sunset, to the afternoon of the 14th or even into the 15th. Further, those who make this change must then find a different explanation for when the Israelites killed the lambs and later left Egypt, which frequently involves leaning on Jewish tradition for support—for those Jewish sects that follow Talmudic traditions promote this divergent perspective.
David C. Grabbe
Why Was Jesus Not Crucified as Passover Began? (Part One)