John 6:62-64

⁶²Then what if you should see the Son of Man going up to where he was before?

⁶³It is the Spirit who makes alive; the flesh profits nothing. The words that I have spoken to you are spirit, and they are life.

⁶⁴Yet there are some of you who do not believe.” For Jesus knew from the beginning who were the ones that would not believe and who it was who would betray him.