Numbers 8:15

15And after that the Levites shall go in to serve at the tent of meeting, when you have cleansed them and offered them as a awave offering.

Numbers 8:19

19 bAnd I have given the Levites as a gift to Aaron and his sons from among the people of Israel, to do the service for the people of Israel at the tent of meeting and cto make atonement for the people of Israel, dthat there may be no plague among the people of Israel when the people of Israel come near the sanctuary.”

Numbers 18:3

3They shall keep guard over you and eover the whole tent, fbut shall not come near to the vessels of the sanctuary or to the altar glest they, and you, die.

Numbers 18:6-7

6 hAnd behold, I have taken your brothers the Levites from among the people of Israel. iThey are a gift to you, given to the Lord, to do the service of the tent of meeting. 7And jyou and your sons with you shall guard your priesthood for all that concerns the altar and kthat is within the veil; and you shall serve. I give your priesthood as a gift,
Hebrew service of gift
and many outsider who comes near shall be put to death.”

2 Chronicles 35:11

11 nAnd they slaughtered the Passover lamb, and the priests othrew the blood that they received from them pwhile the Levites flayed the sacrifices.
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