1 Samuel 27

5. let them give me a place in some town in the country--It was a prudent arrangement on the part of David; for it would prevent him being an object of jealous suspicion, or of mischievous plots among the Philistines. It would place his followers more beyond the risk of contamination by the idolatries of the court and capital; and it would give him an opportunity of making reprisals on the freebooting tribes that infested the common border of Israel and the Philistines.

6. Ziklag--Though originally assigned to Judah ( Joshua 15:31 ), and subsequently to Simeon ( Joshua 19:5 ), this town had never been possessed by the Israelites. It belonged to the Philistines, who gave it to David.

8. David . . . went up, and invaded the Geshurites--(See Joshua 13:2 ).
and the Gizrites--or the Gerizi [GESENIUS], ( Joshua 12:12 ), some Arab horde which had once encamped there.
and the Amalekites--Part of the district occupied by them lay on the south of the land of Israel ( Judges 5:14 , 12:15 ).

10. Achish said, Whither have ye made a road to-day?--that is, raid, a hostile excursion for seizing cattle and other booty.
David said, Against the south of Judah, and against the south of the Jerahmeelites--Jerahmeel was the great-grandson of Judah, and his posterity occupied the southern portion of that tribal domain.
the south of the Kenites--the posterity of Jethro, who occupied the south of Judah ( Judges 1:16 , Numbers 24:21 ). The deceit practised upon his royal host and the indiscriminate slaughter committed, lest any one should escape to tell the tale, exhibit an unfavorable view of this part of David's history.