The more I read of this I believe we are talking about two different meals.
This is true according to what we read in John’s Gospel account. Only John gives us a step by step account of what happened.
Jesus said He would be in the tomb for three nights. This could not be the case if He was crucified on Friday.
(
1) It was on the 10th of Nisan that the lambs would be taken out and examined for four days to make sure they were without spot or blemish. On the 10th of Nisan Jesus rode into Jerusalem on a colt and presented Himself to Israel. We call it Palm Sunday.
(
2) On the 14th of Nisan the lambs were slain for the Passover meal.
The 14th of Nisan began sunset Wednesday and ended sunset Thursday.
a. The “
Last Supper” was not the Passover meal. It was simply the “
last supper” they had together. The upper room was in preparation for the Passover, but they never ate it. We read in Jn. 13:27-29 that when Judas left, the disciples thought he was going to purchase something yet needed for the feast. This he would not, even could not, do if they were eating the Passover meal. Nothing in Jerusalem would have been open.
b. We also know that the “
Last Supper” was not the Passover meal because in Jn. 18:28 Jesus’ accusers would not enter the Roman Praetorium in fear of being defiled and therefore not be allowed to eat the Passover that was yet to be eaten.(
3) The 14th of Nisan was the “
day of preparation for the Passover” (see Jn. 19:14). It was the day the lambs were slain for the Passover meal that was to be eaten later at
twilight (Lev. 23:5).
Early on the morning of the 14th of Nisan Jesus was being tried before Pilate; by 9:00 a.m. He was on the cross; and by 3:00 p.m He was dead. Jesus, God’s unblemished Lamb, was appropriately slain on the “
day of preparation.” The very day the lambs were traditionally slain for the Passover meal.
(
4) In John 19:31 the bodies were requested to be removed from the crosses because it was “
the day of preparation” and they wanted them down before the Sabbath. John notes that the Sabbath referred to was a “
high day.”
(
5) The 15th of Nisan, which began Thursday at sunset and lasted until Friday at sunset, would have been the first day of the “
Feast of Unleavened Bread,” which was a “
sabbath day,” a day of no work (Lev. 23:6-8). This was the anticipated "
high Sabbath John was referring to in Jn. 19:31.
(
6) The
seventh day sabbath began Friday at sunset and lasted until Saturday sunset, and is never referred to as a “
high day.”
That year there were two, back to back, sabbaths. The first day of the “
Feast of Unleavened Bread” (Thursday sunset to Friday sunset), and then the regular, weekly “
seventh day” sabbath (Friday sunset to Saturday sunset).
(
7) Jesus rose from the dead Sunday morning. He was in the tomb Thursday night, Friday night and Saturday night: three nights, just as He said. If he would have been crucified on Friday, as is traditionally taught, He would have been in the tomb only two nights. Jesus, by His bodily resurrection, fulfilled of the “
first fruits” accepted before the Lord on the
first day after the sabbath (Lev. 23:10-11; 1 Cor. 15:20-23).