Genesis 26:7-9

7When the men of the place asked about his wife, he said, “She is my sister,” for he was afraid to say “my wife,” thinking, “The men of the place will kill me on account of Rebekah, for she is a beautiful woman.”

8When Isaac had been there for some time, Abimelech king of the Philistines looked down from the window and was surprised to see Isaac caressing his wife Rebekah.

9Abimelech sent for Isaac and said, “So she is really your wife! How could you say, ‘She is my sister’?” Isaac answered him, “Because I thought I might die on account of her.”