Numbers 20:9

6 And Moses and Aaron leaving the multitude, went into the tabernacle of the covenant, and fell flat upon the ground, and cried to the Lord, and said. O Lord God, hear the cry of this people, and open to them thy treasure, a fountain of living water, that being satisfied, they may cease to murmur. And the glory of the Lord appeared over them.

7 And the Lord spoke to Moses, saying:

8 Take the rod, and assemble the people together, thou and Aaron thy brother, and speak to the rock before them, and it shall yield waters. And when thou hast brought forth water out of the rock, all the multitude and their cattle shall drink.

9 Moses therefore took the rod, which was before the Lord, as he had commanded him,

10 And having gathered together the multitude before the rock, he said to them: Hear, ye rebellious and incredulous: Can we bring you forth water out of this rock?

11 And when Moses bad lifted up his hand, and struck the rock twice with the rod, there came forth water in great abundance, so that the people and their cattle drank,

12 And the Lord said to Moses and Aaron: Because you have not believed me, to sanctify me before the children of Israel, you shall not bring these people into the land, which I will give them.