The sixth part gets turned back to Gog's homeland. So all of Gog's army is not destroyed. Proving that Gog/Magog of Ezekiel 38-39 is not the Gog and Magog participation at the end of the millennium in Revelation 20.
Who is the king of Israel forever in Ezekiel 37 before Gog comes against these chosen people who were brought up.out of their graves?
24 And David my servant shall be king over them; and they all shall have one shepherd: they shall also walk in my judgments, and observe my statutes, and do them.
25 And they shall dwell in the land that I have given unto Jacob my servant, wherein your fathers have dwelt; and they shall dwell therein, even they, and their children, and their children's children for ever: and my servant David shall be their prince for ever.