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.
So he pretended to be crazy in front of Achish and his servants. While he was with them, he acted like a madman and clawed on the doors of the gate and let spit run down his beard.