1 Samuel 21:14 YLT

¹²  And David layeth these words in his heart, and is exceedingly afraid of the face of Achish king of Gath,

¹³  and changeth his behaviour before their eyes, and feigneth himself mad in their hand, and scribbleth on the doors of the gate, and letteth down his spittle unto his beard.

¹⁴  And Achish saith unto his servants, 'Lo, ye see a man acting as a madman; why do ye bring him in unto me?

¹⁵  A lack of madmen 'have' I, that ye have brought in this one to act as a madman by me! doth this one come in unto my house?'