Exodus concludes with the tabernacle filled with the glory of God. That corresponds with New Jerusalem as the eternal tabernacle of God, having the glory of God (Revelation 21:3, 10-11). Then in Revelation 22:1 John tells us that an angel showed him
a river of water of life,
bright as crystal, proceeding out
of the throne of God and of the Lamb
We see a picture of this in Exodus 17. Verses 5-6 say, “Jehovah said to Moses….I will be standing before you there upon the rock in Horeb; and you shall strike the rock, and water will come out of it so that the people may drink.” Speaking about this, 1 Corinthians 10:4 tells us that the people “drank of a spiritual rock which followed them, and the rock was Christ.”
Striking the rock is a picture of Jesus Christ being struck by death on the cross, from which water flowed out, as recorded in John 19:34.
In Exodus God is standing on the Rock, which is Christ, and the water flows out. In Revelation God and the Lamb, who was struck by death to be our Redeemer, are on the throne from which the river of water of life flows out. Exodus 17 matches Revelation 22.
In Numbers 20 Israel had another experience with the rock. This time God instructed Moses to speak to the rock. The application to us is that Christ died once for all; He should not be struck a second time. Daily we can come to Him and speak to Him, asking Him to flow living water to us. This is His promise in John 7:37, “If anyone thirsts, let him come to Me and drink.”
May this Old Testament picture and these New Testament words encourage us to ask the Lord for a drink of living water every day as a foretaste of our drinking the water of life in New Jerusalem.
More about the water out of the rock is in Life-Study of Exodus, chapters 40-42.