Numbers 3:5-8

And Jehovah spake unto Moses, saying, Bring the tribe of Levi near, and set them before Aaron the priest, that they may minister unto him. And they shall keep his charge, and the charge of the whole congregation before the tent of meeting, to do the service of the tabernacle. And they shall keep all the furniture of the tent of meeting, and the charge of the children of Israel, to do the service of the tabernacle.