Genesis 26:9-10

9Then Abimelech called Isaac and said, “See here, Rebekah is in fact your wife! How did you [dare to] say to me, ‘She is my sister’?” And Isaac said to him, “Because I thought I might be killed because of her [desirability].”

10Abimelech said, “What is this that you have done to us? One of the men [among our people] might easily have been intimate with your wife, and you would have brought guilt on us [before God].”