genealogy

Numbers 3:15, 20
"Register the Levites by their families and clans. You are to count every male a month old or more." . . .

Numbers 4:38, 42, 46
Then the Gershonites were numbered by their clans and families, . . .

Numbers 17:2, 3
"Speak to the Israelites and take from them twelve staffs, one from the leader of each tribe. Write each man's name on his staff, . . .

Ezra 2:59
The following came up from Tel-melah, Tel-harsha, Cherub, Addan, and Immer, but could not prove that their families were descended from Israel:

twenty

Numbers 4:3
men from thirty to fifty years old--everyone who is qualified to serve in the work at the Tent of Meeting.

Numbers 8:24
"This applies to the Levites: Men twenty-five years of age or older shall enter to perform the service in the work at the Tent of Meeting.

1 Chronicles 23:24, 27
These were the descendants of Levi by their families--the heads of families, registered individually by name--those twenty years of age or older who worked in the service of the house of the LORD. . . .

by their courses

2 Chronicles 31:2
Hezekiah reestablished the divisions of the priests and Levites--each corresponding to their service among the priests and Levites--for the burnt offerings and peace offerings, for ministry, for giving thanks, and for singing praises at the gates of the LORD's dwelling.

1 Chronicles 24:20-31
Now these were the remaining descendants of Levi: From the sons of Amram: Shubael; from the sons of Shubael: Jehdeiah. . . .

1 Chronicles 25:1-26:32
Additionally, David and the commanders of the army set apart some of the sons of Asaph, Heman, and Jeduthun to prophesy with the accompaniment of lyres, harps, and cymbals. The following is the list of the men who performed this service: . . .