'Cave's' in the Bible

And it came to pass at the time of the going down of the sun, that Joshua commanded, and they took them down off the trees, and cast them into the cave where they had been hid, and laid great stones before the cave's mouth, which remain to this very day.

Leave the cities, and dwell in the rocks, ye inhabitants of Moab, and be like the dove, that maketh her nest in the sides of the cave's mouth.