Charles Ellicott Commentary John 18:21

"Why askest thou me? Ask them that have heard [me], what I spake unto them: behold, these know the things which I said." — John 18:21 (ASV)

Why askest thou me?—Compare John 5:31. The pronoun “Me” is not the emphatic word, as it is generally taken to be. The stress is on the interrogative, “Why, for what purpose, do you ask Me? If you want witnesses, ask those who heard Me.”

Behold, they know what I said.—Better, behold, these know what I said. He probably pointed to some who were then present. In the next verse, there is a reference to the “officers” who, as we know from John 7:32, 46, had heard this doctrine.