61Jesus, aware that his disciples were complaining about this, asked them, “Does this offend you?
62What if you saw the Son of Man ascend to where He was before?
63The Spirit gives life. The flesh profits nothing. The words that I speak to you are spirit and life.
64Yet there are some of you who don’t believe.” Jesus knew from the beginning who didn’t believe, and who would betray Him.
John 6
John 6:61-64