John 6:64-68

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.

And he said, Therefore said I unto you, that no man can come unto me, except it were given unto him of my Father.

From that time many of his disciples went back, and walked no more with him.

Then said Jesus unto the twelve, Will ye also go away?

Then Simon Peter answered him, Lord, to whom shall we go? thou hast the words of eternal life.