John 6:70-71, 17:12

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.

While I was with them, I kept them in your name, which you have given me. I have guarded them, and not one of them has been lost except the son of destruction, that the Scripture might be fulfilled. (ESV)