John Gill Commentary Ezekiel 21:5

"and all flesh shall know that I, Jehovah, have drawn forth my sword out of its sheath; it shall not return any more." — Ezekiel 21:5 (ASV)

That all flesh may know that I the Lord have drawn forth my sword out of his sheath The same with kindling a fire in Judea, (See Gill on Ezekiel 20:48): it shall not return any more ; that is, into its sheath, until it has done all its work; meaning that the Chaldean army should not return to their own land until they had executed the whole will of God upon the Jews; this is the fire that should not be quenched, (Ezekiel 20:48) and here ends the explanation of the said prophecy.