Numbers 3:17
These were the sons of Levi by name: Gershon, Kohath, and Merari.
What it says
Levi's sons are named as Gershon, Kohath, and Merari.
What it is doing
It presents the three main clan branches.
In context
14Then the LORD spoke to Moses in the Wilderness of Sinai, saying, 15“Number the Levites by their families and clans. You are to count every male a month old or more.” 16So Moses numbered them according to the word of the LORD, as he had been commanded. 17These were the sons of Levi by name: Gershon, Kohath, and Merari. 18These were the names of the sons of Gershon by their clans: Libni and Shimei. 19The sons of Kohath by their clans were Amram, Izhar, Hebron, and Uzziel. 20And the sons of Merari by their clans were Mahli and Mushi. These were the clans of the Levites, according to their families.