John 6:36

But though he had done so many miracles before them, yet they believed not on him:

Jesus answered them and said, Verily, verily, I say unto you, Ye seek me, not because ye saw the miracles, but because ye did eat of the loaves, and were filled.

And he said unto him, If they hear not Moses and the prophets, neither will they be persuaded, though one rose from the dead.

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.

If I had not done among them the works which none other man did, they had not had sin: but now have they both seen and hated both me and my Father.

They said therefore unto him, What sign shewest thou then, that we may see, and believe thee? what dost thou work?

And this is the will of him that sent me, that every one which seeth the Son, and believeth on him, may have everlasting life: and I will raise him up at the last day.