1Sam 21:10-15

David Flees to Gath 10David rose and fled that day from Saul; he went to King Achish of Gath.11The servants of Achish said to him, “Is this not David the king of the land? Did they not sing to one another of him in dances, ‘Saul has killed his thousands, and David his ten thousands’?”12David took these words to heart and was very much afraid of King Achish of Gath.13So he changed his behavior before them; he pretended to be mad when in their presence. He scratched marks on the doors of the gate, and let his spittle run down his beard.14Achish said to his servants, “Look, you see the man is mad; why then have you brought him to me?15Do I lack madmen, that you have brought this fellow to play the madman in my presence? Shall this fellow come into my house?”