At harvest-time, the Three, who were part of the Thirty leading warriors, went down to meet David when he was at the cave of Adullam. The Philistine army was camped in the valley of Rephaim.
Later on the prophet came to the king of Israel and told him, “Go and reinforce your defenses, and check what you need to do, because in the spring the king of Aram will come and attack you again.”
It will look as empty as fields after reapers have harvested the grain, gathering up the grain in their arms. It will be like when people pick the heads of grain in the Valley of Rephaim.
The boundary then went through the valley of Ben-hinnom, along the southern slopes of the Jebusites (that is Jerusalem), then on up to the top of the mountain overlooking the valley of Hinnom right up to the northern end of the valley of Rephaim.