Genesis 26:7-9

7And the men of the place asked him of his wife; and he said, She is my sister: for he feared to say, She is my wife; lest, said he, the men of the place should kill me for Rebekah; because she was fair to look upon. 8And it came to pass, when he had been there a long time, that Abimelech king of the Philistines looked out at a window, and saw, and, behold, Isaac was sporting with Rebekah his wife. 9And Abimelech called Isaac, and said, Behold, surely she is thy wife: and how saidst thou, She is my sister? And Isaac said to him, Because I said, Lest I should die on her account.