1 Samuel 21:12-14

Amplified Bible

¹² David took these words to heart and was greatly afraid of Achish king of Gath. ¹³ So [fearing for his life] he changed his behavior in their sight, and acted insanely in their hands, and he scribbled on the doors of the gate, and drooled on his beard. ¹⁴ Then Achish said to his servants, “Look, you see that the man is insane. Why have you brought him to me?