And the sons of Merari by their families: Mahli and Mushi. These are the families of the Levites by their fathers' houses.
Numbers 3:20
Surrounding context
3:19 And the sons of Kohath by their families: Amram, Izehar, Hebron, and Uzziel.
3:20 And the sons of Merari by their families: Mahli and Mushi. These are the families of the Levites by their fathers' houses.
3:21 From Gershon came the family of the Libnites and the family of the Shimites; these were the families of the Gershonites.