Albert Barnes Commentary Ezekiel 47:8

"Then said he unto me, These waters issue forth toward the eastern region, and shall go down into the Arabah; and they shall go toward the sea; into the sea [shall the waters go] which were made to issue forth; and the waters shall be healed." — Ezekiel 47:8 (ASV)

“The sea” is a term commonly applied to the Dead Sea. Compare Deuteronomy 3:17, the sea of the plain (Arabah), even the salt sea. The more literal rendering of the verse in this sense would be, and go into the sea; into the sea go the waters that issue forth, and the waters shall be healed.

Healed - Every living thing (of which there were none before) shall abound in the “healed” waters. The absence of living creatures in the Dead Sea has been remarked by ancient and modern writers. So the water that Jesus gives will bring life to the dead in trespasses and sins. Compare John 4:14; Revelation 22:2–3.