Ezekiel 47:1-12

Then he brought me back to the entrance of the temple; there, water was
flowing from below the threshold of the temple toward the east (for the
temple faced east); and the water was flowing down from below the south
end of the threshold of the temple, south of the altar.  Then he brought
me out by way of the north gate, and led me around on the outside to the
outer gate that faces toward the east; and the water was coming out on the
south side.

Going on eastward with a cord in his hand, the man measured one thousand
cubits, and then led me through the water; and it was ankle- deep.  Again
he measured one thousand, and led me through the water; and it was
knee-deep.  Again he measured one thousand, and led me through the water;
and it was up to the waist.  Again he measured one thousand, and it was a
river that I could not cross, for the water had risen; it was deep enough
to swim in, a river that could not be crossed.  He said to me, "Mortal,
have you seen this?"

Then he led me back along the bank of the river.  As I came back, I saw on
the bank of the river a great many trees on the one side and on the other.
He said to me, "This water flows toward the eastern region and goes down
into the Arabah; and when it enters the sea, the sea of stagnant waters,
the water will become fresh.  Wherever the river goes, every living
creature that swarms will live, and there will be very many fish, once
these waters reach there.  It will become fresh; and everything will live
where the river goes.  People will stand fishing beside the sea from
En-gedi to En-eglaim; it will be a place for the spreading of nets; its
fish will be of a great many kinds, like the fish of the Great Sea.  But
its swamps and marshes will not become fresh; they are to be left for
salt.  On the banks, on both sides of the river, there will grow all kinds
of trees for food.  Their leaves will not wither nor their fruit fail, but
they will bear fresh fruit every month, because the water for them flows
from the sanctuary.  Their fruit will be for food, and their leaves for
healing."