1 Samuel 27:10-12

10And Achish said, Where have ye plundered to day? And David said, Against the south of Judah, and against the south of the Jerahmeelites, and against the south of the Kenites.1 11And David saved neither man nor woman alive, to bring tidings to Gath, saying, Lest they should inform against us, saying, So did David, and so will be his manner all the while he dwelleth in the country of the Philistines. 12And Achish believed David, saying, He hath made his people Israel utterly to abhor him; therefore he shall be my servant for ever.2