1 Samuel 21:2

21:2 David replied to Ahimelech the priest, “The king instructed me to do something, but he said to me, ‘Don’t let anyone know the reason I am sending you or the instructions I have given you.’ I have told my soldiers to wait at a certain place.

1 Samuel 21:13

21:13 He altered his behavior in their presence. Since he was in their power, he pretended to be insane, making marks on the doors of the gate and letting his saliva run down his beard.