Numbers 3:6-8 Num. 3:6-8
6 Bring the tribe of Levi near, and present them before Aaron the priest, that they may minister unto him. 7 And they shall keep his charge, and the charge of the whole congregation before the tabernacle of the congregation, to do the service of the tabernacle. 8 And they shall keep all the instruments of the tabernacle of the congregation, and the charge of the children of Israel, to do the service of the tabernacle.
Ezra 6:18 Ezra 6:18
And they set the priests in their divisions, and the Levites in their courses, for the service of God, which is at Jerusalem; as it is written in the book of Moses.
(Relation)