1 Samuel 24:1-3

Now when Saul returned from pursuing the Philistines, it was reported to him, saying, “Behold, David is in the wilderness of Engedi.”

Then Saul took three thousand chosen men from all Israel and went to search for David and his men in front of the Rocks of the Mountain Goats.

And he came to the sheepfolds on the way, where there was a cave; and Saul went in to relieve himself. Now David and his men were sitting in the inner recesses of the cave.