Read 1 Samuel 27:11 Using Other Translations
And David saved neither man nor woman alive, to bring tidings to Gath, saying, Lest they should tell on us, saying, So did David, and so will be his manner all the while he dwelleth in the country of the Philistines.
And David would leave neither man nor woman alive to bring news to Gath, thinking, "lest they should tell about us and say, 'So David has done.'" Such was his custom all the while he lived in the country of the Philistines.
No one was left alive to come to Gath and tell where he had really been. This happened again and again while he was living among the Philistines.