John 6:62-64

New Revised Standard Version, Anglicised Catholic Edition

⁶² Then what if you were to see the Son of Man ascending to where he was before? ⁶³ It is the spirit that gives life; the flesh is useless. The words that I have spoken to you are spirit and life. ⁶⁴ But among you there are some who do not believe.’ For Jesus knew from the first who were the ones that did not believe, and who was the one that would betray him.