John 6:62-64

Revised Standard Version Catholic Edition

⁶² Then what if you were to see the Son of man ascending where he was before?^{[a] 63} It is the spirit that gives life, the flesh is of no avail; the words that I have spoken to you are spirit and life. ⁶⁴ But there are some of you that do not believe.” For Jesus knew from the first who those were that did not believe, and who it was that should betray him.