But David thought to himself, “One of these days I will be destroyed by the hand of Saul. The best thing I can do is to escape to the land of the Philistines. Then Saul will give up searching for me anywhere in Israel, and I will slip out of his hand.”
References for 1 Samuel 27:1
So David and the six hundred men with him left and went over to Achish son of Maok king of Gath.
When Saul was told that David had fled to Gath, he no longer searched for him.
Then David said to Achish, “If I have found favor in your eyes, let a place be assigned to me in one of the country towns, that I may live there. Why should your servant live in the royal city with you?”
So on that day Achish gave him Ziklag, and it has belonged to the kings of Judah ever since.