Numbers 3:19-21

Young's Literal Translation

¹⁹ And the sons of Kohath, by their families, [are] Amram and Izhar, Hebron and Uzziel.

²⁰ And the sons of Merari by their families [are] Mahli and Mushi; these are the families of the Levites, by the house of their fathers.

²¹ Of Gershon [is] the family of the Libnite, and the family of the Shimite; these are the families of the Gershonite.