2 Samuel 5:17-20

17When the Philistines heard that David had been anointed king of Israel, all of them came to attack David. But David heard about it and went to the fortress.

18The Philistines had come and overrun the valley of Rephaim.

19David asked the Lord, “Should I attack the Philistines? Will you hand them over to me?” The Lord answered David, “Attack! I will certainly hand the Philistines over to you.”

20So David went to Baal Perazim and defeated the Philistines there. He said, “The Lord has overwhelmed my enemies in front of me like an overwhelming flood.” That is why that place is called Baal Perazim [The Lord Overwhelms].