John 6:64-71 NIV

[64] Yet there are some of you who do not believe.” For Jesus had known from the beginning which of them did not believe and who would betray him. [65] He went on to say, “This is why I told you that no one can come to me unless the Father has enabled them.” [66] From this time many of his disciples turned back and no longer followed him. [67] “You do not want to leave too, do you?” Jesus asked the Twelve. [68] Simon Peter answered him, “Lord, to whom shall we go? You have the words of eternal life. [69] We have come to believe and to know that you are the Holy One of God.” [70] Then Jesus replied, “Have I not chosen you, the Twelve? Yet one of you is a devil!” [71] (He meant Judas, the son of Simon Iscariot, who, though one of the Twelve, was later to betray him.)