2 Samuel 5:17-20

And when the Philistines heard that they had anointed David king over Israel, all the Philistines went up to seek David; and David heard of it, and went down to the stronghold. Now the Philistines had come and spread themselves in the valley of Rephaim. And David inquired of Jehovah, saying, Shall I go up against the Philistines? wilt thou deliver them into my hand? And Jehovah said unto David, Go up; for I will certainly deliver the Philistines into thy hand. And David came to Baal-perazim, and David smote them there; and he said, Jehovah hath broken mine enemies before me, like the breach of waters. Therefore he called the name of that place Baal-perazim.