Judges 6:21

In this verse, Gideon watched as the “angel of the Lord” used his staff to touch the offering of meat and bread.  At that point, fire came from the rock and the offering and the angel of the Lord were suddenly gone.

Earlier in the Old Testament, God provides water from a rock.  If God can bring forth water or fire from a rock, he can do anything.  We should never underestimate God!