Albert Barnes Commentary 2 Chronicles 35:7-11

"And Josiah gave to the children of the people, of the flock, lambs and kids, all of them for the passover-offerings, unto all that were present, to the number of thirty thousand, and three thousand bullocks: these were of the king`s substance. And his princes gave for a freewill-offering unto the people, to the priests, and to the Levites. Hilkiah and Zechariah and Jehiel, the rulers of the house of God, gave unto the priests for the passover-offerings two thousand and six hundred [small cattle], and three hundred oxen. Conaniah also, and Shemaiah and Nethanel, his brethren, and Hashabiah and Jeiel and Jozabad, the chiefs of the Levites, gave unto the Levites for the passover-offerings five thousand [small cattle], and five hundred oxen. So the service was prepared, and the priests stood in their place, and the Levites by their courses, according to the king`s commandment. And they killed the passover, and the priests sprinkled [the blood which they received] of their hand, and the Levites flayed them." — 2 Chronicles 35:7-11 (ASV)

See the marginal references and note.

2 Chronicles 35:8

His princes—that is, his ecclesiastical princes, the chief men of the priests and Levites. For the poor families of their own order, the leading priests provided both Passover cattle and cattle for thank offerings. The chief Levites acted similarly toward the poor Levitical families.