Genesis 12:12

12:12 When the Egyptians see you they will say, ‘This is his wife.’ Then they will kill me but will keep you alive.

Genesis 26:7

26:7 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.”