Gog - is not mentioned by name in any existing prophecy before Ezekiel’s time. The reference here shows
(1) that the conflict with Gog does not represent a particular event, but one of which the prophets in general had to speak;
(2) that in the interpretation of Old Testament prophecy we are to look beyond special fulfillments.
Events in the world’s history come within a prophet’s ken as parts of the divine administration whereby evil struggles against but is overcome by good. As every such conflict is a prelude to the final struggle, so its prediction has reference ultimately to the consummation here foretold.