וַיָּ֨קָם יְהוֹרָ֜ם עַל־מַמְלֶ֤כַת אָבִיו֙ וַיִּתְחַזַּ֔ק וַיַּהֲרֹ֥ג אֶת־כָּל־אֶחָ֖יו בֶּחָ֑רֶב וְגַ֖ם מִשָּׂרֵ֥י יִשְׂרָאֵֽל׃
Now when Jehoram was risen up over the kingdom of his father, and had strengthened himself, he slew all his brethren with the sword, and divers also of the princes of Israel.
Find Talmudic references to II Chronicles 21:4: , passages from the Talmud Bavli and Yerushalmi.