John 6:67-71

Jesus said therefore unto the twelve, Would ye also go away? Simon Peter answered him, Lord, to whom shall we go? thou hast the words of eternal life. And we have believed and know that thou art the Holy One of God. Jesus answered them, Did not I choose you the twelve, and one of you is a devil? Now he spake of Judas the son of Simon Iscariot, for he it was that should betray him, being one of the twelve.