David did not leave a man or woman alive to be brought to Gath, for he said, "Otherwise they will report us, saying, 'This is what David did.'" And this was David's custom the whole time he lived in Philistine territory.

1 Samuel 27:10
who would ask him, "What have you raided today?" And David would reply, "The Negev of Judah," or "The Negev of Jerahmeel," or "The Negev of the Kenites."

1 Samuel 27:12
So Achish trusted David, thinking, "Since he has made himself an utter stench to his people Israel, he will be my servant forever."

1 Samuel 30:2
They had taken captive the women and all who were there, both young and old. They had not killed anyone, but had carried them off as they went on their way.

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 dwells in the country of the Philistines.