Jerry might be one of those folks that has the argument all worked out in his mind before he ever posts. And if anyone veers from the way he thinks the argument should go, he's lost.
You put me down despite the fact that you have yet to prove that anything I said here is in error:
First let us look at this translation from the KJV in a little more detail:
"Now the first day of the feast of unleavened bread the disciples came to Jesus, saying unto him, Where wilt thou that we prepare for thee to eat the passover?... Now when the even was come, he sat down with the twelve. And as they did eat, he said, Verily I say unto you, that one of you shall betray me. And they were exceeding sorrowful, and began every one of them to say unto him, Lord, is it I? And he answered and said, He that dippeth his hand with me in the dish, the same shall betray me" (Mt.26:17-18,20-23).
Now let us look at the same exact event described in the book of Mark:
"And the first day of unleavened bread, when they killed the passover, his disciples said unto him, Where wilt thou that we go and prepare that thou mayest eat the passover?... And in the evening he cometh with the twelve....And as they sat and did eat, Jesus said, Verily I say unto you, One of you which eateth with me shall betray me. And they began to be sorrowful, and to say unto him one by one, Is it I? and another said, Is it I? And he answered and said unto them, It is one of the twelve, that dippeth with me in the dish" (Mk.14:12,17-20).
It is obvious to anyone with an open mind that the the events described in Matthew which I quoted are the same exact events described in Mark which I quoted.
You have not even attempted to prove what I said there is in error.
And these words from Mark prove that the day spoken of is not the first day of the feast of unleavened bread, as you imagine:
"And the first day of unleavened bread, when they killed the passover, his disciples said unto him, Where wilt thou that we go and prepare that thou mayest eat the passover?"(Mk.14:12; KJV).
Here we see exactly what was being referred to as the Lord's Passover:
"And thus shall ye eat it; with your loins girded, your shoes on your feet, and your staff in your hand; and ye shall eat it in haste: it is the Lord's Passover" (Ex.12:11).
Common sense dictates that the Passover lamb had already been killed by the time when the Lord's Passover was eaten. That happened on the 14th:
"And in the fourteenth day of the first month is the passover of the LORD" (Num.28:16).
The Passover lamb was killed on the 14th and so this verse is describing the events which happened on the 14th, and not the 15th, the first day of the feast of unleavened bread:
"And the first day of unleavened bread, when they killed the passover, his disciples said unto him, Where wilt thou that we go and prepare that thou mayest eat the passover?" (Mk.14:12).
You did not even attempt to prove that I am in error when I said that.
Therefore, this following verse, which is speaking about the same exact day, also happened on the 14th day:
"Now the first day of the feast of unleavened bread the disciples came to Jesus, saying unto him, Where wilt thou that we prepare for thee to eat the passover?" (Mt.26:17; KJV).
We can know that it was an error when the KJV translator added the words "feast of" to this verse because the "first day of the feast of unleavened bread" did not begin until the 15th:
"And on the fifteenth day of the same month is the feast of unleavened bread unto the LORD: seven days ye must eat unleavened bread" (Lev.23:5).
You have said absolutely nothing which refutes anything which I said. In fact, you did not even attempt to prove anything I said is in error. Why is that?