1 Samuel 24:2

Rocks — Which the wild goats used to delight in and climb over. These very rocks are exceeding steep, and full of precipices, and dangerous to travellers, as an eye — witness hath left upon record. And yet Saul was so transported with rage, as to venture himself and his army here, that he might take David, who, as he thought, would judge himself safe, and therefore be secure in such inaccessible places.