Genesis 26:7-9

7When the men of that place asked about his wife, Isaac answered, “She’s my sister.” He was afraid to say “my wife.” He thought that the men of that place would kill him to get Rebekah, because she was an attractive woman.

8When he had been there a long time, King Abimelech of the Philistines looked out of his window and saw Isaac caressing his wife Rebekah.

9Abimelech called for Isaac and said, “So she’s really your wife! How could you say, ‘She’s my sister’?” Isaac answered him, “I thought I would be killed because of her.”