1 Samuel 21:13-15

Leeser(i) 13 (21:14) And he disguised his reason before their eyes, and played the madman in their hands, and scribbled on the doors of the gate, and let his spittle run down upon his beard. 14 (21:15) Then said Achish unto his servants, Lo, ye see, the man is mad: wherefore then will ye bring him to me? 15 (21:16) Have I lack of madmen, that ye have brought this man to play his pranks about me? shall this one come into my house?