Genesis 26:8-11

One day, after Isaac had lived there awhile, the Philistine king Abimelech looked out his window and saw Isaac affectionately caressing his wife Rebekah. So Abimelech summoned Isaac and said, “So, this woman is your wife! Why did you say that she was your sister?” “Because I thought the men of the land would kill me and take her,” Isaac said. “Don’t you realize what you’ve done to us?” Abimelech asked. “One of our men might have slept with your wife, and you would have brought guilt and punishment upon us!” So Abimelech issued a stern warning to all the people, saying, “Whoever lays a hand on this man or his wife shall be put to death!”