Matthew Henry on 2 Chronicles 30:21–end
After the passover followed the feast of unleavened bread, which continued seven days. How that was observed we are here told, and every thing in this account looks pleasant and lively. 1. Abundance of sacrifices were offered to God in peace-offerings, by which they both acknowledged and implored the favour of God, and on part of which the offerers feasted with their friends during these seven days (Ch2 30:22), in token of their communion with God and the comfort they took in his favour and their reconciliation to him. To keep up this part of the service, that God's altar might be abundantly regaled with the fat and blood and his priests and people with the flesh of the peace-offerings, Heze…
Read the whole note in the consoleJamieson-Fausset-Brown on 2 Chronicles 30:24
and a great number of priests sanctified themselves--so that there would be a sufficient number of hands for the additional services.
Next: 2 Chronicles Chapter 31
Adam Clarke on 2 Chronicles 30:26
Since the time of Solomon - there was not the like in Jerusalem - For from that time the ten tribes had been separated from the true worship of God, and now many of them for the first time, especially from Asher, Issachar, Ephraim, Manasseh, and Zebulun, joined to celebrate the passover.
John Gill on 2 Chronicles 30:26
So there was great joy in Jerusalem,.... Not merely carnal, expressed in eating and drinking, and making merry with one another, but spiritual, on account of the restoration of temple service, and the feasts of the Lord:
for since the time of Solomon the son of David, king of Israel, there was not the like in Jerusalem; not the like joy, so spiritual, sincere, and hearty; nor such a number of persons rejoicing together on such an occasion; nor for so many days together, which were as many as at the dedication of the temple by Solomon.
Tyndale Open Study Notes on 2 Chronicles 30:26