The peoples, the nations, around New Jerusalem participate in the general blessings of the new earth. These nations (plural) are distinct from the people (singular) who live in Christ with the reality of God’s new creation; these are the constituents of New Jerusalem and partake of the special blessings in this city. Revelation 22:2 says,
He showed me a river of water of life….on this side and on that side of the river was the tree of life, producing twelve fruits, yielding its fruit each month; and the leaves of the tree are for the healing of the nations.
There are three provisions here: the water of the river of life, the fruits of the tree of life, and the leaves of the tree. The leaves are specifically designated for the healing of the nations around New Jerusalem. In contrast, the water and the fruit symbolize the supply of divine life to the people built into New Jerusalem.
The life supply of the water continues our drinking the Spirit in John 4 and 7. “Jesus stood and cried out, saying, If anyone thirsts, let him come to Me and drink….This He said concerning the Spirit” (John 7:37-39).
The life supply of the fruit continues our eating Jesus as the bread of life in John 6. ” I am the living bread which came down out of heaven; if anyone eats of this bread, he shall live forever” (v. 51).
In John 6:56 the Lord tells us, “He who eats My flesh and drinks My blood abides in Me and I in him.” In verse 63 He explains that this is not physical; instead, “It is the Spirit who gives life; the flesh profits nothing; the words which I have spoken to you are spirit and are life.” The mutual abiding requires our spiritual eating now and the fullest mutual abiding in New Jerusalem matches our spiritual eating of the fruit of the tree of life.