Many presume that because this was a preparation day, Christ must have been crucified on the day before the weekly Sabbath, but they are incorrect; it was an annual Sabbath: The first day of Unleavened Bread (see Luke and John below).
John 19:13-14, 31
The Jews therefore, because it was the preparation, that the bodies should not remain upon the cross on the sabbath day, (for that sabbath day was an high day,) besought Pilate that their legs might be broken, and that they might be taken away.
Abib is the first month of the year.
Luke 22:7, 14
1 Corinthians 11:23-26
twilight: the time between when the sun starts to go down, and complete darkness; twilight represents the start of a new day
The night Christ was betrayed was the same night that the Jews were hastily (in fear) eating the Passover meal as the angel of death swept across Egypt, striking the first-born.
Passover and Unleavened Bread are clearly two separate days: Abib 14 and 15; today many Jewish people merge the two days in one: Abib 15
The left Egypt the next morning (still Passover Day) but they didn’t have time to add the yeast to the bread and let it rise; hence: unleavened bread. (We now keep this as the Night to Be Much Observed, in remembrance)
600,000 Israelites + women and children; 2.5 million people total at a modest estimate. It would take several hours for them to depart and cross the Red Sea.
The were in Egypt for 430 years; they depart on the anniversary of their enslavement.
Genesis 14:11-Genesis 15:21
Matthew 27:45, 50
The connection from Passover in Genesis to the New Testament can be seen in these scriptures.