וַיִּפְשַׁ֨ע אֱד֜וֹם מִתַּ֣חַת יַד־יְהוּדָ֗ה עַ֚ד הַיּ֣וֹם הַזֶּ֔ה אָ֣ז תִּפְשַׁ֥ע לִבְנָ֛ה בָּעֵ֥ת הַהִ֖יא מִתַּ֣חַת יָד֑וֹ כִּ֣י עָזַ֔ב אֶת־יְהוָ֖ה אֱלֹהֵ֥י אֲבֹתָֽיו׃
So Edom revolted from under the hand of Judah unto this day; then did Libnah revolt at the same time from under his hand; because he had forsaken the LORD, the God of his fathers.
Read midrashic interpretation of II Chronicles 21:10: and classical rabbinic exegesis.