John 6:30

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

But if I do, though ye believe not me, believe the works: that ye may know, and believe, that the Father is in me, and I in him.

For the Jews require a sign, and the Greeks seek after wisdom:

But I said unto you, That ye also have seen me, and believe not.

And it shall come to pass, if they will not believe thee, neither hearken to the voice of the first sign, that they will believe the voice of the latter sign.

And he gave a sign the same day, saying, This is the sign which the LORD hath spoken; Behold, the altar shall be rent, and the ashes that are upon it shall be poured out.

Then answered the Jews and said unto him, What sign shewest thou unto us, seeing that thou doest these things?

God also bearing them witness, both with signs and wonders, and with divers miracles, and gifts of the Holy Ghost, according to his own will?

The altar also was rent, and the ashes poured out from the altar, according to the sign which the man of God had given by the word of the LORD.

By stretching forth thine hand to heal; and that signs and wonders may be done by the name of thy holy child Jesus.

And the Pharisees came forth, and began to question with him, seeking of him a sign from heaven, tempting him.

Let Christ the King of Israel descend now from the cross, that we may see and believe. And they that were crucified with him reviled him.

That say, Let him make speed, and hasten his work, that we may see it: and let the counsel of the Holy One of Israel draw nigh and come, that we may know it!

(For his disciples were gone away unto the city to buy meat.)