Thematic Bible: Passes as isaac's sister

So Isaac settled in Gerar. When the men of that place asked him about his wife, he replied, "She is my sister." He was afraid to say, "She is my wife," for he thought to himself, "The men of this place will kill me to get Rebekah because she is very beautiful." After Isaac had been there a long time, Abimelech king of the Philistines happened to look out a window and observed Isaac caressing his wife Rebekah. read more.
So Abimelech summoned Isaac and said, "She is really your wife! Why did you say, 'She is my sister'?" Isaac replied, "Because I thought someone might kill me to get her." Then Abimelech exclaimed, "What in the world have you done to us? One of the men might easily have had sexual relations with your wife, and you would have brought guilt on us!" So Abimelech commanded all the people, "Whoever touches this man or his wife will surely be put to death."