Genesis 26:7-9

New Catholic Bible

⁷ The men of that place asked him about his wife, and he said, “She is my sister,” for he was afraid to say, “She is my wife,” thinking that the men of that place would kill him because Rebekah was very beautiful.

⁸ He had been there for quite some time when Abimelech, the king of the Philistines, came to the window and saw Isaac caressing his wife Rebekah. ⁹ Abimelech called to Isaac and said, “Surely, she is your wife. Why did you say, ‘She is my sister’?”

Isaac answered him, “Because I thought I might be killed on her account!”