Bible Verses About Insanity: Feigned by David

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.

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

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?'