@jespah,
The books of Matthew, Mark and Luke, all describe the last supper as a Passover Seder, which was held in the evening of the 14th day of Nisan, and not on the 15th day, as did the Jewish church, which is the first day of the seven-day Festival of Unleavened Bread.
The Passover was a one-day Festival. Exodus 12, 14; You must celebrate '
THIS DAY' as a religious festival to remind you of what I, the LORD, have done. Celebrate it for all time to come.”
Leviticus 23, 5; The Passover, celebrated to honour the LORD, begins at sunset on the fourteenth day of the first month. On the fifteenth day the Festival of Unleavened Bread begins, and for seven days you must not eat any bread made with yeast. The Jews, for their own reasons, rejected God's Day of the 14th and decided to hold their Passover meal in the evening of the 15th day.
There was no Pascal Lamb at the Last supper of Jesus, he gave to his disciples the bread and wine as a substitute and symbolic of the reality of the Passover Lamb, '
HIS BODY AND BLOOD.'