Numbers 8:22
The people did everything Jehovah commanded Moses concerning the Levites. Thus the Levites were qualified to work in the tent under Aaron and his sons.
Numbers 8:15
Once you have made them clean and presented them as an offering, the Levites may come and do their work at the tent of meeting.
2 Chronicles 30:15-17
They slaughtered the Passover lambs on the fourteenth of the second month. The priests and Levites were ashamed of themselves. They consecrated themselves and brought burnt offerings to the house of Jehovah.
2 Chronicles 30:27
The Levitical priests arose and blessed the people. Their voice was heard and their prayer came to God's holy dwelling place, to heaven.
2 Chronicles 31:2
Hezekiah assigned the priests and the Levites to divisions. Each priest or Levite was put in a division based on the service he performed. The services included: sacrificing burnt offerings, sacrificing fellowship offerings, serving, giving thanks, or praising within the gates of Jehovah's camp.
2 Chronicles 35:8-15
Josiah's officials also voluntarily gave some of their animals to the people, the priests, and the Levites as sacrifices. Hilkiah, Zechariah, and Jehiel, who were the officials in charge of the Temple, gave the priests twenty-six hundred sheep and lambs and three hundred bulls to sacrifice during the Passover celebration.