Genesis 26:7-9

His wife Rebekah was very beautiful, and the men of that place asked Isaac about her. Isaac said, “She is my sister,” because he was afraid to tell them she was his wife. He thought they might kill him so they could have her. Isaac lived there a long time. One day as Abimelech king of the Philistines looked out his window, he saw Isaac holding his wife Rebekah tenderly. Abimelech called for Isaac and said, “This woman is your wife. Why did you say she was your sister?” Isaac said to him, “I was afraid you would kill me so you could have her.”