Genesis 26:9-10

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.”

10Then Abimelech said, “What have you done to us! One of the people might have easily gone to bed with your wife, and then you would have made us guilty of sin.”