John 6:64, 70-71

But there are some of you who do not believe.” (For Jesus knew from the beginning who those were who did not believe, and who it was who would betray him.)

Jesus answered them, “Did I not choose you, the twelve? And yet one of you is a devil.” He spoke of Judas the son of Simon Iscariot, for he, one of the twelve, was going to betray him.