1 Samuel 21:15 in the King James Version
Have I need of mad men, that ye have brought this fellow to play the mad man in my presence? shall this fellow come into my house?
Context
14 Then Achish said to his servants, “Look, you see the man is insane. Why then have you brought him to me?
15 Do I lack madmen, that you have brought this fellow to play the madman in my presence? Should this fellow come into my house?”