II Chronicles 21:18 Midrash

וְאַחֲרֵ֖י כָּל־זֹ֑את נְגָפ֨וֹ יְהוָ֧ה ׀ בְּמֵעָ֛יו לָחֳלִ֖י לְאֵ֥ין מַרְפֵּֽא׃

And after all this the LORD smote him in his bowels with an incurable disease.

Read midrashic interpretation of II Chronicles 21:18: and classical rabbinic exegesis.