From Ezekiel 40 through the end of the chapter, it is a beautiful allegory of the work that Jesus came to do, where He put everything in His temple (His church) in order where it should be.
"You have heard... but I say unto you".
Near the end of the book, in chapter 47, you have an allegory of the Holy Ghost flowing out of the church and into the world, gathering magnitude and momentum as it goes (water to ankles, then knees, then loins, then to swim in). A result of that river was healing for people of all nations, and fish of all types - which is obviously referring to converts of every race.
Jesus confirmed that this "issuing of water" was referring to Holy Ghost.
John 7:37-39
In the last day, that great day of the feast, Jesus stood and cried, saying, If any man thirst, let him come unto me, and drink. He that believeth on me, as the scripture hath said, out of his belly shall flow rivers of living water. (But this spake he of the Spirit, which they that believe on him should receive: for the Holy Ghost was not yet given; because that Jesus was not yet glorified.)
There is no other scripture that Jesus can be referring to when he says "out of your bellies shall flow rivers of living water". John identified that as referencing the Holy Ghost, which was given at Pentecost.
Peter said the Gentiles were given the identical gift of the Holy Ghost (Acts 11:17)
Ezekiel 40-48 is allegorical and symbolic in regards to the temple, the water, the fish, the trees, and the land. This one temple that the water issues out of is a church made up of all nations and languages.
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