He spake of Judas Iscariot, [the son] of Simon,.... These are the words of the evangelist, pointing out the person Christ intended, lest any other should be suspected:
for he it was that should betray him: as it was determined and foretold, and which Christ knew full well, and therefore said the above words:
being one of the twelve; apostles, whom Christ had chosen, and which was an aggravation of his crime.