1 Samuel 27:11

7The number of the days that David lived in the country of the Philistines was a full year and four months.

8David and his men went up and raided the Geshurites, the Girzites, and the Amalekites; for those were the inhabitants of the land who were of old, on the way to Shur, even to the land of Egypt.

9David struck the land, and saved no man or woman alive, and took away the sheep, the cattle, the donkeys, the camels, and the clothing. Then he returned, and came to Achish.

10Achish said, “Against whom have you made a raid today?” David said, “Against the South of Judah, against the South of the Jerahmeelites, and against the South of the Kenites.”

11David saved neither man nor woman alive to bring them to Gath, saying, “Lest they should tell about us, saying, ‘David did this, and this has been his way all the time he has lived in the country of the Philistines.’”

12Achish believed David, saying, “He has made his people Israel utterly to abhor him. Therefore he will be my servant forever.”