Genesis 26:9

Abimelech called Isaac, and said, “Behold, surely she is your wife. Why did you say, ‘She is my sister’?” Isaac said to him, “Because I said, ‘Lest I die because of her.’”

And Abimelech called Isaac, and said, Behold, of a surety she is thy wife: and how saidst thou, She is my sister? And Isaac said unto him, Because I said, Lest I die for her.