1.) The last supper was the Pesach seder, the following Scriptures clearly tells us this.
Matthew 26:17-20 Now on the first day of Unleavened Bread the disciples came to Jesus, saying, “Where will you have us prepare for you to eat the Passover?”
Mark 14:12-18 And on the first day of Unleavened Bread, when they sacrificed the Passover lamb, his disciples said to him, “Where will you have us go and prepare for you to eat the Passover?”
Luke 22:7-20 Then came the day of Unleavened Bread, on which the Passover lamb had to be sacrificed. So, Jesus sent Peter and John, saying, “Go and prepare the Passover for us, that we may eat it.”
Is this a mistranslation? In all 3 Gospels? What are we to make of it?
No, it’s not mistranslated. It simply highlights that our understanding of God’s festivals is inadequate.
It is not a case of not having enough information, but rather people not accepting the information given by the eyewitness accounts in scripture.
It can be due to a lack of understanding or it being in conflict with how people perceive the event.
Yet these scriptures are fundamental in synchronizing the timeline.
Now that we agree that the Passover lamb was slaughtered on the 14th, these Scriptures clearly places Jesus on the 14th day when He instructs His disciples to go and prepare for the PASSOVER, also known as the Annual Preparation Day or preparation day for the Passover week.
This phrase is also often confused with the six verses referencing the crucifixion day as the day of preparation, not realizing that there are multiple days that qualify as the day of preparation.
Our discussion about how Passover was celebrated is basically summarized here in the New Testament, through the three Synoptic Gospels.
That night, the 15th, during the Passover cedar Jesus introduces the Communion. This is critical for it replaces the old with the new at the correct point in time and introduces or establishes the New Covenant on the 15th impeccably.
The physical lambs were a shadow of what was to come, simply a pointer to Jesus.
Denying this implies the New Covenant was introduced on an arbitrary day, which it wasn’t.
Some suggest that Jesus only ate the last supper, which is blatantly ignoring the clear instruction from Jesus to His disciples in the text to go and prepare for the
Passover and suggesting that Jesus was a lawbreaker, which He wasn’t.
In fact, Luk 22: 15 reiterate Jesus’s own desire for
eating this Passover.
Luk 22: 15 And he said to them, “I have earnestly desired to eat this Passover with you before I suffer.
Now the night of His capture is a direct link to Israel being freed that very same night from bondage in Egypt and occurs just after midnight.
Now for those who say that they were not allowed to leave the house till morning, Moses and Aaron did when they appeared before pharaoh Ex 12:31, so there are exceptions yet ignored or argued into submission.
The Passover lamb was cooked over a fire, yet Jesus was crucified, again ignored, therefore not all the symbolism is needed or required to align Jesus as “The Passover Lamb,” but I am sure people will still struggle to accept this or find a reason to disagree.
Pharaoh declared Israel free to leave after midnight when he called Moses and Aaron to appear before him, and in the same manner, Jesus became the Passover lamb who redeemed us from sin.
Israel was led out of Egypt the same day at sunrise, the daypart still being the 15th. Likewise in the New Covenant, we were led out from sin.
Jewish tradition linking the 15th to the exodus, and the 21st to the red sea crossing. Both annual Sabbaths.
Anyway, that's my standpoint on it.
Shalom