Just want to be clear that the lamb was not killed on the 14th, Leviticus 23:6 states the Feast of Unleavened Bread is "on the Fifteenth Day of this month (Aviv)". From this verse it appears that the passover sacrifice is to be brought at sunset at the end of the 14th and eaten on the night of the 15th. This is confirmed by Dueteronomy 16:4, which commands us regarding the Passover Sacrifice: "and there shall not remain of the meat that you slaughter at evening on the first day until the morning." It is clear then and confirmed that the lamb sacrifice is slaughtered and eaten "at evening on the first day" (the 15th).
getting late I'll finish later
Sure it was. that is unless you think Christ got the Passover wrong...
Luk 22:11 Then you shall say to the master of the house, 'The Teacher says to you, "Where is the guest room where I may eat the Passover with My disciples?" '
Luk 22:15 Then He said to them, "With fervent desire I have desired to eat this Passover with you before I suffer;
Luk 22:16 for I say to you, I will no longer eat of it until it is fulfilled in the kingdom of God."
Luk 22:17 Then He took the cup, and gave thanks, and said, "Take this and divide it among yourselves;
Luk 22:18 for I say to you, I will not drink of the fruit of the vine until the kingdom of God comes."
Luk 22:19 And He took bread, gave thanks and broke it, and gave it to them, saying, "This is My body which is given for you; do this in remembrance of Me."
Luk 22:20 Likewise He also took the cup after supper, saying, "This cup is the new covenant in My blood, which is shed for you.
Now when was Christ taken?
Mat 26:19 So the disciples did as Jesus had directed them; and they prepared the Passover.
Mat 26:20 When evening had come, He sat down with the twelve.
This is the evening of the 14th just after sunset.
Mat 26:27 Then He took the cup, and gave thanks, and gave it to them, saying, "Drink from it, all of you.
Mat 26:28 For this is My blood of the new covenant, which is shed for many for the remission of sins.
Mat 26:29 But I say to you, I will not drink of this fruit of the vine from now on until that day when I drink it new with you in My Father's kingdom."
Mat 26:30 And when they had sung a hymn, they went out to the Mount of Olives.
And what happened at the Mount of Olives?
Mat 26:42 Again, a second time, He went away and prayed, saying, "O My Father, if this cup cannot pass away from Me unless I drink it, Your will be done."
Mat 26:43 And He came and found them asleep again, for their eyes were heavy.
Mat 26:44 So He left them, went away again, and prayed the third time, saying the same words.
Mat 26:45 Then He came to His disciples and said to them, "Are you still sleeping and resting? Behold, the hour is at hand, and the Son of Man is being betrayed into the hands of sinners.
Mat 26:46 Rise, let us be going. See, My betrayer is at hand."
Mat 26:47 And while He was still speaking, behold, Judas, one of the twelve, with a great multitude with swords and clubs, came from the chief priests and elders of the people.
Mat 26:48 Now His betrayer had given them a sign, saying, "Whomever I kiss, He is the One; seize Him."
Mat 26:49 Immediately he went up to Jesus and said, "Greetings, Rabbi!" and kissed Him.
Joh 19:14 Now it was the Preparation Day of the Passover, and about the sixth hour. And he said to the Jews, "Behold your King!"
So Christ is betrayed that night and without writing a book, suffice it to say, He was crucified the next day on the Passover. He was the Passover. He had to be buried quickly that afternoon before sunset. Why?
Joh 19:30 So when Jesus had received the sour wine, He said, "It is finished!" And bowing His head, He gave up His spirit.
Joh 19:31 Therefore, because it was the Preparation Day, that the bodies should not remain on the cross on the Sabbath (
for that Sabbath was a high day), the Jews asked Pilate that their legs might be broken, and that they might be taken away.
Yep, that Sabbath was a high day, the First Day of Unleavened Bread, the 15th day of the first month.
Now it is pretty easily provable that the one who spoke to Israel in Lev 23 was the one who became Jesus Christ. I would reckon He knew which day to keep the Passover on, wouldn't you?