John 6:61-65

But Jesus, aware that His disciples were complaining about this, said to them, “Is this offensive to you?

What then if you see the Son of Man ascending to where He was before?

It is the Spirit who gives life; the flesh provides no benefit; the words that I have spoken to you are spirit, and are life.

But there are some of you who do not believe.” For Jesus knew from the beginning who they were who did not believe, and who it was who would betray Him.

And He was saying, “For this reason I have told you that no one can come to Me unless it has been granted him from the Father.” Peter’s Confession of Faith