Genesis 20:2-6

And Abraham said of his wife Sarah, “She is my sister.” So Abimelech king of Gerar sent men and took Sarah.

But God came to Abimelech in a dream of the night, and said to him, “Behold, you are a dead man because of the woman whom you have taken, for she is married.”

Now Abimelech had not come near her; and he said, “Lord, will You kill a nation, even though blameless?

Did he himself not 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.”

Then God said to him in the dream, “Yes, I know that in the integrity of your heart you have done this, and I also kept you from sinning against Me; therefore I did not let you touch her.