Genesis 15:8

And he said, O Lord God, how may I be certain that it will be mine?

And Zacharias said to the angel, How may I be certain of this? For I am an old man, and my wife is far on in years.

Then Gideon said to God, If you are going to give Israel salvation by my hand, as you have said,

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?

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.

And Abraham said to his chief servant, the manager of all his property, Come now, put your hand under my leg:

See, I am waiting here by the water-spring; and the daughters of the town are coming out to get water:

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.

If they say to us, Keep quiet where you are till we come to you; then we will keep our places and not go up to them.

And Mary said to the angel, How may this be, because I have had no knowledge of a man?

Treasury of Scripture Knowledge

And he said, Lord GOD, whereby shall I know that I shall inherit it?

And Abraham said to his chief servant, the manager of all his property, Come now, put your hand under my leg:

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.

If they say to us, Keep quiet where you are till we come to you; then we will keep our places and not go up to them.

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?

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.

And Zacharias said to the angel, How may I be certain of this? For I am an old man, and my wife is far on in years.