'Rock' in the Bible

Behold, I will stand before thee there upon the rock on Horeb; and thou shalt strike the rock, and there shall come water out of it, that the people may drink. And Moses did so before the eyes of the elders of Israel.

And Jehovah said, Behold, there is a place by me: there shalt thou stand on the rock.

And it shall come to pass, when my glory passeth by, that I will put thee in a cleft of the rock, and will cover thee with my hand, until I have passed by.