Exodus 6:19

And the sons of Merari; Mahali and Mushi: these are the families of Levi according to their generations.

And the sons of Merari, Mahali, and Mushi,.... From whence sprung the families of the Mahalites, and Mushites, Numbers 3:33:

these are the families of Levi, according to their generations: the families that descended from him and his sons, according to the order of their birth.