Ezra 6:18
And they set the priests in their classes, and the Levites in their divisions, for the service of God, which is at Jerusalem: as it is written in the book of Moses.
Numbers 3:6
Bring the tribe of Levi near, and present them before Aaron the priest, that they may minister unto him;
1 Chronicles 24:1
And the divisions of the sons of Aaron: the sons of Aaron, Nadab and Abihu, Eleazar and Ithamar.
2 Chronicles 35:4-5
and prepare yourselves by your fathers' houses, in your divisions, according to the writing of David king of Israel, and according to the writing of Solomon his son;
Numbers 8:9-26
And thou shalt bring the Levites before the tent of meeting; and thou shalt gather together the whole assembly of the children of Israel.
1 Chronicles 23:1-26
And David was old and full of days; and he made Solomon his son king over Israel.