John 6:60-71 CSB
Therefore, when many of his disciples heard this, they said, “This teaching is hard. Who can accept it?”
Jesus, knowing in himself that his disciples were grumbling about this, asked them, “Does this offend you? Then what if you were to observe the Son of Man ascending to where he was before? The Spirit is the one who gives life. The flesh doesn’t help at all. The words that I have spoken to you are spirit and are life. But there are some among you who don’t believe.” (For Jesus knew from the beginning those who did not believe and the one who would betray him.) He said, “This is why I told you that no one can come to me unless it is granted to him by the Father.”
From that moment many of his disciples turned back and no longer accompanied him. So Jesus said to the Twelve, “You don’t want to go away too, do you?”
Simon Peter answered, “Lord, to whom will we go? You have the words of eternal life. We have come to believe and know that you are the Holy One of God.”
Jesus replied to them, “Didn’t I choose you, the Twelve? Yet one of you is a devil.” He was referring to Judas, Simon Iscariot’s son, one of the Twelve, because he was going to betray him.
CSB: Christian Standard Bible