Now when the even was come, he sat down with the twelve.…
The form of the question in the original suggests that they expected a negative answer, and might be reproduced in English, "Surely it is not I?" None of them could think that he was the traitor, yet none of them could be sure that he was not. Their Master knew better than they did; and so, from a humble knowledge of what lay in them, coiled and slumbering, but there, they will not meet His words with a contradiction, but with a questions
(A. Maclaren, D. D.)
Parallel VersesKJV: Now when the even was come, he sat down with the twelve.