Then God bade him go with some elders to the rock on Horeb, and fetch water out of it. The elders were to accompany him there, that they might be convinced that he was not bringing water from a well, but smiting it from a rock. To accomplish this miracle, God bade him smite the rock with his rod, as the people labored under the impression that this rod could only bring destruction, for through its agency Moses had brought the ten plagues upon the Egyptians in Egypt, and at the Red Sea; now they were to see that it could work good also.
Upon God's bidding, Moses told the people to choose from which rock they wished water to flow, and hardly had Moses touched with his sapphire rod the rock which they had chosen, when plenteous water flowed from it. The spot where this occurred, God called Massah, and Meribah, because Israel had there tried their God, saying, "If God is Lord over all, as over us; if He satisfies our needs, and will further show us that He knows our thoughts, then will we serve Him, but not otherwise."