Genesis 20:2-8

Abraham said [again] of Sarah his wife, “She is my sister.” So Abimelech king of Gerar sent and took Sarah [into his harem]. But God came to Abimelech in a dream during the night, and said, “Behold, you are a dead man because of the woman whom you have taken [as your wife], for she is another man’s wife.” Now Abimelech had not yet come near her; so he said, “Lord, will you kill a people who are righteous and innocent and blameless [regarding Sarah]? Did Abraham not tell me, ‘She is my sister?’ And she herself said, ‘He is my brother.’ In the integrity of my heart and innocence of my hands I have done this.” Then God said to him in the dream, “Yes, I know you did this in the integrity of your heart, for it was I who kept you back and spared you from sinning against Me; therefore I did not give you an opportunity to touch her. So now return the man’s wife, for he is a prophet, and he will pray for you and you will live. But if you do not return her [to him], know that you shall die, you and all who are yours (your household).” So Abimelech got up early in the morning and called all his servants and told them all these things; and the men were terrified.