Ezra 6:18
and they have established the priests in their divisions, and the Levites in their courses, over the service of God that is in Jerusalem, as it is written in the book of Moses.
Numbers 3:6
'Bring near the tribe of Levi, and thou hast caused it to stand before Aaron the priest, and they have served him,
1 Chronicles 24:1
And to the sons of Aaron are their courses: sons of Aaron are Nadab, and Abihu, Eleazar, and Ithamar,
2 Chronicles 35:4-5
and prepare, by the house of your fathers, according to your courses, by the writing of David king of Israel, and by the writing of Solomon his son,
Numbers 8:9-26
and thou hast brought near the Levites before the tent of meeting, and thou hast assembled the whole company of the sons of Israel,
1 Chronicles 23:1-26
And David is old, and satisfied with days, and causeth his son Solomon to reign over Israel,