Numbers 3:5-8 NIV

5 The LORD said to Moses,
6 “Bring the tribe of Levi and present them to Aaron the priest to assist him.

References for Numbers 3:6

7 They are to perform duties for him and for the whole community at the tent of meeting by doing the work of the tabernacle.

References for Numbers 3:7

8 They are to take care of all the furnishings of the tent of meeting, fulfilling the obligations of the Israelites by doing the work of the tabernacle.