1 Samuel 27:11-12

27:11 Neither man nor woman would David leave alive so as to bring them back to Gath. He was thinking, “This way they can’t tell on us, saying, ‘This is what David did.’” Such was his practice the entire time that he lived in the country of the Philistines. 27:12 So Achish trusted David, thinking to himself, “He is really hated among his own people in Israel! From now on he will be my servant.”