1 Samuel 21:10-15

10David fled that day from Saul’s presence and went to King Achish of Gath.

11But Achish’s servants said to him, “Isn’t this David, the king of the land? Don’t they sing about him during their dances: Saul has killed his thousands, but David his tens of thousands?”

12David took this to heart and became very afraid of King Achish of Gath,

13so he pretended to be insane in their presence. He acted like a madman around them, scribbling on the doors of the city gate and letting saliva run down his beard.

14“Look! You can see the man is crazy,” Achish said to his servants. “Why did you bring him to me?

15Do I have such a shortage of crazy people that you brought this one to act crazy around me? Is this one going to come into my house?”