וְעָלִ֙יתָ֙ עַל־עַמִּ֣י יִשְׂרָאֵ֔ל כֶּֽעָנָ֖ן לְכַסּ֣וֹת הָאָ֑רֶץ בְּאַחֲרִ֨ית הַיָּמִ֜ים תִּֽהְיֶ֗ה וַהֲבִאוֹתִ֙יךָ֙ עַל־אַרְצִ֔י לְמַעַן֩ דַּ֨עַת הַגּוֹיִ֜ם אֹתִ֗י בְּהִקָּדְשִׁ֥י בְךָ֛ לְעֵינֵיהֶ֖ם גּֽוֹג׃ (ס)
and thou shalt come up against My people Israel, as a cloud to cover the land; it shall be in the end of days, and I will bring thee against My land, that the nations may know Me, when I shall be sanctified through thee, O Gog, before their eyes.
Read halakhic rulings (Jewish law) on Ezekiel 38:16: and classical halakhic sources.