1 Samuel 27:7-12

7 The number of the days that David lived in the country of the Philistines was a full year and four months.
8 David and his men went up, and made a raid on the Geshurites, and the Girzites, and the Amalekites; for those [nations] were the inhabitants of the land, who were of old, as you go to Shur, even to the land of Egypt.
9 David struck the land, and saved neither man nor woman alive, and took away the sheep, and the oxen, and the donkeys, and the camels, and the clothing; and he returned, and came to Achish.
10 Achish said, Against whom have you made a raid today? David said, Against the South of Judah, and against the South of the Jerahmeelites, and against the South of the Kenites.
11 David saved neither man nor woman alive, to bring them to Gath, saying, Lest they should tell of us, saying, So did David, and so has been his manner all the while he has lived in the country of the Philistines.
12 Achish believed David, saying, He has made his people Israel utterly to abhor him; therefore he shall be my servant forever.
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