Genesis 26:9-11

9So Abimelech called Isaac and said, “Behold, she is your wife. How then could you say, ‘She is my sister’?” Isaac said to him, “Because I thought, ‘Lest I die because of her.’” 10Abimelech said, “What is this you have done to us? One of the people might easily have lain with your wife, and you would have brought guilt upon us.” 11So Abimelech warned all the people, saying, “Whoever touches this man or his wife shall surely be put to death.”