'Cave' in the Bible

So David left Gath and took refuge in the cave of Adullam. When David’s brothers and his father’s whole family heard, they went down and joined him there.

When Saul came to the sheep pens along the road, a cave was there, and he went in to relieve himself. David and his men were staying in the back of the cave,

With these words David persuaded his men, and he did not let them rise up against Saul.Then Saul left the cave and went on his way.

After that, David got up, went out of the cave, and called to Saul, “My lord the king!” When Saul looked behind him, David bowed to the ground in homage.

You can see with your own eyes that the Lord handed you over to me today in the cave. Someone advised me to kill you, but I took pity on you and said: I won’t lift my hand against my lord, since he is the Lord’s anointed.