Charles Ellicott Commentary 2 Chronicles 30:24

"For Hezekiah king of Judah did give to the assembly for offerings a thousand bullocks and seven thousand sheep; and the princes gave to the assembly a thousand bullocks and ten thousand sheep: and a great number of priests sanctified themselves." — 2 Chronicles 30:24 (ASV)

Did give ... gave. — Had presented (Exodus 35:24)—that is, for sacrifice as a tĕrûmâh, or “heave offering.” The gifts of king and princes for the Mazzôth festival were so abundant that they sufficed not only for the feast itself, but also for an additional week of rejoicing.

And a great number of priests. —Literally, and priests had sanctified themselves in great numbers, or abundantly. The priests no longer hung back as they had done previously (2 Chronicles 30:3; 2 Chronicles 30:15; 2 Chronicles 29:34). There was now no lack of persons duly purified for the sacrifice of so many victims.