Ezra 6:18
And they set the priests in their divisions and the Levites in their courses over the work 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
The sons of Aaron also had their courses. The sons of Aaron: Nadab, Abihu, Eleazar, and Ithamar.
2 Chronicles 35:4-5
and prepare yourselves by the houses of your fathers, after your courses, 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 offer the Levites before the tabernacle of the testimony, and thou shalt gather the whole congregation of the sons of Israel together;
1 Chronicles 23:1-26
So when David was old and full of days, he made Solomon, his son, king over Israel.