Genesis 26:8-9

8 It came about, when he had been there a long time, that Abimelech king of the Philistines looked out through a window, and saw, and behold, Isaac was caressing his wife Rebekah. 9 Then Abimelech called Isaac and said, “Behold, certainly she is your wife! How then did you say, ‘She is my sister’?” And Isaac said to him, “Because I said, ‘I might die on account of her.’”