Num Numbers, chapter Book of Numbers, chapter 3
They shall keep his requirements, and the requirements of the whole congregation before the Tent of Meeting, to do the service of the tabernacle. They shall keep all the furnishings of the Tent of Meeting, and the obligations of the children of Israel, to do the service of the tabernacle. Lev 8:35You shall give the Levites to Aaron and to his sons. They are wholly given to him on the behalf of the children of Israel. Num 8:19