Genesis 26:9-10

9Abimelech called Isaac to come to him. He said, ‘Rebekah is your wife! Why did you say, “She is my sister”?’ Isaac replied, ‘I thought that someone might kill me because of her.’

10Abimelech said, ‘You have done a bad thing against us! One of my men might have had sex with your wife. Then we would have been guilty of a bad sin.’