5 YHWH said to Moses, “Walk on before the people, and take the elders of Israel with you, and take the rod in your hand with which you struck the Nile, and go. 6 Behold, I will stand before you there on the rock in Horeb. You shall strike the rock, and water will come out of it, that the people may drink.” Moses did so in the sight of the elders of Israel. Exodus 17:5-6WEB
This passage contains a positive command, directed toward Moses: "Bring the elders of Israel to the Rock or Horeb, and strike the rock so that it will produce water for the people to drink.".
This command contributes to an understanding of Prophecy as it is a command for God's Prophet, Moses, to perform a sign before the people of Israel, and to provide for them thus.
The command was immediately fulfilled by Moses. We know that the providence provided to God's covenant people, the water of life, is the truth of the Gospel, which finds its fulfillment in Jesus, which leads one never again to thirst, and which gives eternal life. (See John 4:10)
Notes on Interpretation/Application