1 Samuel 29:1-2
1-2The Philistines mustered all their troops at Aphek. Meanwhile Israel had made camp at the spring at Jezreel. As the Philistine warlords marched forward by regiments and divisions, David and his men were bringing up the rear with Achish.
3The Philistine officers said, "What business do these Hebrews have being here?"
Achish answered the officers, "Don't you recognize David, ex-servant of King Saul of Israel? He's been with me a long time. I've found nothing to be suspicious of, nothing to complain about, from the day he defected from Saul until now."