Valley of Rephaim
When David became king over all Israel, the Philistines, judging that he would now become their uncompromising enemy, made a sudden attack upon Hebron, compelling David to retire from it. He sought refuge in “the hold” at Adullam (2 Samuel 5:17-22), and the Philistines took up their position in the valley of Rephaim, on the west and southwest of Jerusalem.
Thus all communication between Bethlehem and Jerusalem was intercepted. While David and his army were encamped here, there occurred that incident narrated in 2 Samuel 23:15-17. Having obtained divine direction, David led his army against the Philistines, and gained a complete victory over them. The scene of this victory was afterwards called Baalperazim.
A second time, however, the Philistines rallied their forces in this valley (2 Samuel 5:22). Again warned by a divine oracle, David led his army to Gibeon, and attacked the Philistines from the south, inflicting on them another severe defeat, and chasing them with great slaughter to Gezer. There David kept in check these enemies of Israel. This valley is now called el-Bukei'a.