Numbers 8:22
Then after that the Levites went in to perform their service in the Tent of Meeting before Aaron and his sons; just as the Lord had commanded Moses concerning the Levites, so they did to them.
Numbers 8:15
Then after that the Levites may go in to serve the Tent of Meeting (tabernacle), but you shall cleanse them [first] and present them as a wave offering;
2 Chronicles 30:15-17
Then they slaughtered the Passover lambs on the fourteenth day of the second month. And the priests and the Levites were ashamed of themselves, and consecrated themselves and brought burnt offerings to the house of the Lord.
2 Chronicles 30:27
Then the priests and Levites stood and blessed the people; and their voice was heard and their prayer came up to His holy dwelling place, to heaven.
2 Chronicles 31:2
And Hezekiah appointed the divisions of the priests, and the Levites by their divisions, each in accordance with his service, both the priests and Levites, for burnt offerings and for peace offerings, to minister and to give thanks and to praise in the gates of the camp of the Lord.
2 Chronicles 35:8-15
His officers also contributed a voluntary offering to the people, the priests and the Levites. Hilkiah, Zechariah, and Jehiel, the officials of the house of God, gave to the priests for the Passover offerings 2,600 from the flocks [of lambs and young goats], and 300 bulls.