Matthew 26:22-25

Lord, is it I? Not one of them ventures to question the truth of the Lord's prophecy; and each asks the personal question, "Is it I"? No one accuses, even by implication, his neighbor. He that dippeth [his] hand with me in the dish. In Oriental meals, instead of plates being used, each one helps himself with his fingers from the dish as he needs. From Joh 13:23-26 we learn that these words were spoken to the disciple that leaned on the Savior's bosom and were unheard by Judas and the rest. As it is written of him. "As it was determined" (Lu 22:22), in prophecy.

It had been good for that man. A declaration of the awful judgment that would befall the traitor.
Thou hast said. In other words, "Thou art the traitor". John says that Jesus then said to Judas, "What thou doest, do quickly" and that he "immediately went out, and it was night" (Joh 13:27,30). Judas, therefore, left before the Lord's Supper was instituted.
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