Ezekiel 38:16-17

and thou shalt come up against my people Israel, as a cloud to cover the land: it shall come to pass in the latter days, that I will bring thee against my land, that the nations may know me, when I shall be sanctified in thee, O Gog, before their eyes. Thus saith the Lord Jehovah: Art thou he of whom I spake in old time by my servants the prophets of Israel, that prophesied in those days for many years that I would bring thee against them?