Luke 22:23

‘And they began to question among themselves, which of them it was who would do this thing.'

Such a statement as Jesus had made could only cause surprise and concern. And yet it seems that they were sufficiently aware of their own weakness to recognise that it could be true, although they may well have thought at the time that He meant betray Him accidentally. Otherwise we would have expected a vociferous denial. But the eyewitness remembered the discussions well, and commented on them. It had been the least tasteful thing about those last hours. It was a reminder of the fact that the one who stands must beware lest he fall (1 Corinthians 10:12). But all the while Judas had to keep up his act, as the discussion went on around him. His heart had to be rigidly set to do evil.