Now, may the girl to whom I say, Let down your vessel and give me a drink, and who says in answer, Here is a drink for you and let me give water to your camels: may she be the one marked out by you for your servant Isaac: so may I be certain that you have been good to my master Abraham.

And Hezekiah said to Isaiah, What is to be the sign that the Lord will make me well, and that I will go up to the house of the Lord on the third day? And Isaiah said, This is the sign the Lord will give you, that he will do what he has said; will the shade go forward ten degrees or back? And Hezekiah said in answer, It is a simple thing for the shade to go forward; but let it go back ten degrees.read more.
Then Isaiah the prophet made prayer to the Lord, and he made the shade go back ten degrees from its position on the steps of Ahaz.

And Hezekiah said, What is the sign that I will go up to the house of the Lord?

Make a request to the Lord your God for a sign, a sign in the deep places of the underworld, or in the high heavens.

So he said to him, If now I have grace in your eyes, then give me a sign that it is you who are talking to me.

Then some of the scribes and Pharisees, hearing this, said to him, Master, we are looking for a sign from you.

And the Pharisees and Sadducees came and, testing him, made a request to him to give them a sign from heaven.

And the Pharisees came out and put questions to him, requesting from him a sign from heaven, testing him.

And others, testing him, were looking for a sign from heaven from him.

Then the Jews put this question to him: What sign of authority have you to give us, seeing that you do these things?

So they said, What sign do you give us, so that we may see and have faith in you? What do you do?

Now when Herod saw Jesus he was very glad, having for a long time had a desire to see him, for he had had accounts of him, and was hoping to see some wonders done by him.

But he, answering, said to them, An evil and false generation is looking for a sign; and no sign will be given to it but the sign of the prophet Jonah:

An evil and false generation is searching after a sign; and no sign will be given to it but the sign of Jonah. And he went away from them.

Seeing that the Jews make request for signs, and the Greeks are looking for knowledge:

Then Jesus said to him, You will not have faith if you do not see signs and wonders.