1 Samuel 23:25-28

25So when Saul and his men began the search, David was informed. Then he went down to the rocky area and stayed in the wilderness of Maon. On hearing this, Saul pursued David in the wilderness of Maon.

26Then, while Saul was advancing on one side of the mountain, David and his men were on the other side of the mountain. David was hurrying to elude Saul. Meanwhile Saul and his men were closing-in on David and his men to seize them.

27But a messenger came to Saul saying, “Hurry and come, for the Philistines have invaded the land!”

28So Saul had to return from chasing after David, and go to engage the Philistines. Therefore they called that place the Rock of Separation.