John 6:62 KJV

Many therefore of his disciples, when they had heard this, said, This is an hard saying; who can hear it?

When Jesus knew in himself that his disciples murmured at it, he said unto them, Doth this offend you?

It is the spirit that quickeneth; the flesh profiteth nothing: the words that I speak unto you, they are spirit, and they are life.

But there are some of you that believe not. For Jesus knew from the beginning who they were that believed not, and who should betray him.