וְקָרָ֨אתִי עָלָ֤יו לְכָל־הָרַי֙ חֶ֔רֶב נְאֻ֖ם אֲדֹנָ֣י יְהוִ֑ה חֶ֥רֶב אִ֖ישׁ בְּאָחִ֥יו תִּֽהְיֶֽה׃
And I will call for a sword against him throughout all my mountains, saith the Lord GOD; every man’s sword shall be against his brother.
Read midrashic interpretation of Ezekiel 38:21: and classical rabbinic exegesis.