The Bible says that the rock that Moses smote on two different occasions was Christ. Each time, water flowed out of the rock supplying life sustaining water to the thirsty Israelites. (1Cor.10:1-4)

The first time appears to be a type of baptism in Jesus name; the second time appears to be a type of baptism of the Holy Ghost speaking in tongues.

The first time, God told Moses to smite the rock with the rod that turned the river to blood. Thus, there was the remembrance of blood when the water flowed out of the rock. (Ex.7:20,17:5-6)

The second time, Moses was to speak to the rock and the water would flow out. (Num.20:8)

Thus, when Jesus said upon this rock I will build my church, he was speaking of building the church upon Himself, the smitten rock out of which came water and Spirit. (Matt.16:18)

{Jn.19:34,Matt.26:28,Zech.12:10,13:1,Jn.7:37-39,Act.2:38}