And Hezekiah rejoiced, and all the people, that God had prepared the people: for the thing was done suddenly.
The temple being cleansed, we have here an account of the good use that was immediately made of it. A solemn assembly was called to meet the king at the temple, the very next day (Ch2 29:20); and very glad, no doubt, all the good people in Jerusalem were, when it was said, Let us go up to the house of the Lord, Psa 122:1.
Commenting on 2 Chronicles 29:20-36
THE HOUSE OF GOD CLEANSED. (2Ch. 29:12-36) Then the Levites arose--Fourteen chiefs undertook the duty of collecting and preparing their brethren for the important work of cleansing the Lord's house. Beginning with the outer courts--that of the priests and that of the people--the cleansing of these occupied eight days, after which they set themselves to purify the interior; but as the Levites were not allowed...
Commenting on 2 Chronicles 29:12-36
And Hezekiah rejoiced, and all the people, that God had prepared the people: for the thing was [done] suddenly. (r) He shows that religion cannot proceed unless God touches the heart of the people.