Duties of the Priest

Num. 3:5 - 13 (Aaron & the Levites)
Deut. 10:8 - 9 (Levites appointed to carry the Tabernacle)
Num. 3:40 - 51 (Levites accepted as substitute for the First Born)
Lev. 21:1 - 24 (Instructions for Priests)
Num. 18:1 - 7 (Duties of the Priests and Levites)
Num. 18:21 - 24 (What the Levites receive)
Num. 18:25 - 32 (What the Levites must give)
Num. 4:1 - 20 (Duties of the Kohathite Clans)
Num. 4:21 - 28 (Duties of the Girshite Clans)
Num. 4:29 - 33 (Duties of the Merarite Clans)