'Fresh' in the Bible

He said to me, "These waters go out toward the eastern region and flow down into the Arabah; when they enter the Dead Sea, where the sea is stagnant, the waters become fresh.

Every living creature which swarms where the river flows will live; there will be many fish, for these waters flow there. It will become fresh and everything will live where the river flows.

But its swamps and its marshes will not become fresh; they will remain salty.