Genesis 20:1-5

Abraham moved south to the Negev and lived for a while between Kadesh and Shur, and then he moved on to Gerar. While living there as a foreigner, Abraham introduced his wife, Sarah, by saying, “She is my sister.” So King Abimelech of Gerar sent for Sarah and had her brought to him at his palace. But that night God came to Abimelech in a dream and told him, “You are a dead man, for that woman you have taken is already married!” But Abimelech had not slept with her yet, so he said, “Lord, will you destroy an innocent nation? Didn’t Abraham tell me, ‘She is my sister’? And she herself said, ‘Yes, he is my brother.’ I acted in complete innocence! My hands are clean.”