Bring the tribe of Levi near, and present them before Aaron the priest, that they may minister unto him.
And thou shalt bring the Levites before the tabernacle of the congregation: and thou shalt gather the whole assembly of the children of Israel together:
This is it that belongeth unto the Levites: from twenty and five years old and upward they shall go in to wait upon the service of the tabernacle of the congregation:
And David divided them into courses among the sons of Levi, namely, Gershon, Kohath, and Merari.
Now these are the divisions of the sons of Aaron. The sons of Aaron; Nadab, and Abihu, Eleazar, and Ithamar.
And stand in the holy place according to the divisions of the families of the fathers of your brethren the people, and after the division of the families of the Levites.