And a river went out of Eden to water the garden; and from there it was parted, and became four heads.
All Commentaries on Genesis 2:10 Go To Genesis 2
Ephrem The Syrian
AD 373
After having spoken of Paradise and the day on which it was planted, as well as the introduction into it of Adam, and the Tree of Life and its companion, Scripture turns to describe the river which goes out from its midst, and how it is divided up outside Paradise into four sources: "A river was issuing from Eden to irrigate Paradise. " [ Gen2:10 ] Notice that here too it calls the delightful land of Paradise "Eden."
Had that river not first irrigated Paradise it would not have divided up into four sources outside it. I think it was perhaps for purposes of convenience that it was said to "irrigate," seeing that the spiritual trees of Paradise do not require any irrigation by water. But if, despite their being spiritual, they nevertheless absorbed something of those blessed and spiritual waters there, I should not object to such an opinion.
The taste of the water of the four tributaries which flow from that river is not like the taste of the head of the source. For if water varies in taste in our countries, all of which are subject to the sentence of the curse, how much more would one expect the taste in the blessed land of Eden to be different from that of the land which was laid under the curse of the Just One as a result of Adam's transgression?