I Samuel 26:2-4

Then Saul arose and went down to the Wilderness of Ziph, having three thousand chosen men of Israel with him, to seek David in the Wilderness of Ziph. And Saul encamped in the hill of Hachilah, which is opposite Jeshimon, by the road. But David stayed in the wilderness, and he saw that Saul came after him into the wilderness. David therefore sent out spies, and understood that Saul had indeed come.