Genesis 26:8-9

New International Version

⁸ When Isaac had been there a long time, Abimelek king of the Philistines^(A) looked down from a window and saw Isaac caressing his wife Rebekah. ⁹ So Abimelek summoned Isaac and said, “She is really your wife! Why did you say, ‘She is my sister’?^(B)”

Isaac answered him, “Because I thought I might lose my life on account of her.”