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.”

Genesis 39:6

39:6 So Potiphar left everything he had in Joseph’s care; he gave no thought to anything except the food he ate.

Now Joseph was well built and good-looking.