וַיִּשְׂמַ֤ח יְחִזְקִיָּ֙הוּ֙ וְכָל־הָעָ֔ם עַ֛ל הַהֵכִ֥ין הָאֱלֹהִ֖ים לָעָ֑ם כִּ֥י בְּפִתְאֹ֖ם הָיָ֥ה הַדָּבָֽר׃ (פ)
And Hezekiah rejoiced, and all the people, because of that which God had prepared for the people; for the thing was done suddenly.
Read midrashic interpretation of II Chronicles 29:36: and classical rabbinic exegesis.