Genesis 26:5

2 And the Lord came to him in a vision and said, Do not go down to Egypt; keep in the land of which I will give you knowledge:

3 Keep in this land, and I will be with you and give you my blessing; for to you and to your seed will I give all these lands, giving effect to the oath which I made to your father Abraham;

4 I will make your seed like the stars of heaven in number, and will give them all these lands, and your seed will be a blessing to all the nations of the earth;

5 Because Abraham gave ear to my voice and kept my words, my rules, my orders, and my laws.

6 So Isaac went on living in Gerar;

7 And when he was questioned by the men of the place about his wife, he said, She is my sister; fearing to say, She is my wife; for, he said, the men of the place may put me to death on account of Rebekah; because she is very beautiful.

8 And when he had been there for some time, Abimelech, king of the Philistines, looking through a window, saw Isaac playing with Rebekah his wife.