1 Samuel 27:10-12

10Achish would ask, “Where have you raided today?” So David would reply, “Against the Negev of Judah, against the Negev of the Jerahmeelite and against the Negev of the Kenites.”

11David left no man or woman alive to bring to Gath, thinking, “Unless they should tell about us, saying: ‘So did David.’” So was his practice all the time he stayed in the country of the Philistines.

12Then Achish trusted David, saying, “He has certainly made himself abhorrent to his people Israel; therefore, he will be my vassal forever.”