Moses and the Israelites use water from the rock

On their journey through the desert the Israelites run out of water. God tells Moses to strike a rock with his stick. Moses obeys, and water comes out of the rock.

Lucas van Leyden doesn't show the actual miracle, but a scene a bit later on.

He didn't use oil paint but egg tempera, a cheaper choice. The downside is that tempera tends to get darker over time.