1 Samuel 21:13-15

New International Version

¹³ So he pretended to be insane^(A) in their presence; and while he was in their hands he acted like a madman, making marks on the doors of the gate and letting saliva run down his beard.

¹⁴ Achish said to his servants, “Look at the man! He is insane! Why bring him to me? ¹⁵ Am I so short of madmen that you have to bring this fellow here to carry on like this in front of me? Must this man come into my house?”