Genesis 20:2-8

2And Abraham said of Sarah his wife, "She is my sister." And Abimelech king of Gerar sent and took Sarah.

3But God came to Abimelech in a dream by night and said to him, "Behold, you are a dead man because of the woman whom you have taken, for she is a man's wife."

4Now Abimelech had not approached her. So he said, "Lord, will you kill an innocent people?

5Did he not himself say to me, 'She is my sister'? And she herself said, 'He is my brother.' In the integrity of my heart and the innocence of my hands I have done this."

6Then God said to him in the dream, "Yes, I know that you have done this in the integrity of your heart, and it was I who kept you from sinning against me. Therefore I did not let you touch her.

7Now then, return the man's wife, for he is a prophet, so that he will pray for you, and you shall live. But if you do not return her, know that you shall surely die, you and all who are yours."

8So Abimelech rose early in the morning and called all his servants and told them all these things. And the men were very much afraid.