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.
Don’t be afraid of people, who can kill the body but cannot kill the soul. The only one you should fear is the one who can destroy the soul and the body in hell.
But David thought to himself, “Saul will catch me someday. The best thing I can do is escape to the land of the Philistines. Then he will give up looking for me in Israel, and I can get away from him.”