John 6:61-64

⁶¹But Jesus witting at or within himself, that his disciples grutched of this thing, said to them, This thing offendeth you?

⁶²Therefore if ye see man’s Son ascending or going up, where he was before?

⁶³It is the spirit that quickeneth, the flesh profiteth nothing; the words that I have spoken to you, be spirit and life.

⁶⁴But there be some of you that believe not. For Jesus knew from the beginning, which were believing, and who was to betray him.