Genesis 26:8-10

And it came to pass, when he had been there a long time, that Abim´elech king of the Philistines looked out at a window, and saw, and, behold, Isaac was sporting with Rebekah his wife. And Abim´elech called Isaac, and said, Behold, of a surety she is thy wife: and how saidst thou, She is my sister? And Isaac said unto him, Because I said, Lest I die for her. And Abim´elech said, What is this thou hast done unto us? one of the people might lightly have lain with thy wife, and thou shouldest have brought guiltiness upon us.