Numbers 3:33 KJV

Of Merari was the family of the Mahlites, and the family of the Mushites: these are the families of Merari.

The Levites numbered by their families, Their dutiesThe Levites were in three classes, according to the sons of Levi; Gershon, Kohath, and Merari; and these were subdivided into families. The posterity of...

Numbers 3:20 And the sons of Merari by their families; Mahli, and Mushi. These are the families of the Levites according to the house of their fathers.
1 Chronicles 6:19 The sons of Merari; Mahli, and Mushi. And these are the families of the Levites according to their fathers.
1 Chronicles 23:21 The sons of Merari; Mahli, and Mushi. The sons of Mahli; Eleazar, and Kish.

From OpenBible.info, most relevant first.

MerariSad; bitter, the youngest son of Levi, born before the descent of Jacob into Egypt, and one of the seventy who accompanied him thither...

Of Merari לִמְרָרִי limrārî מְרָרִי Proper name · with preposition
the family מִשְׁפַּחַת mišpaḥat מִשְׁפָּחָה Noun · feminine singular construct
of the Mahlites הַמַּחְלִי hammaḥlî מַחְלִי Noun · masculine singular · with the
and the family וּמִשְׁפַּחַת ûmišpaḥat מִשְׁפָּחָה Noun · feminine singular construct · with and
of the Mushites הַמּוּשִׁי hammûšî מוּשִׁי Noun · masculine singular · with the
these are the families אֵלֶּה ʾēllê Pronoun הֵם hēm Pronoun · third person masculine plural מִשְׁפְּחֹת mišpĕḥōt מִשְׁפָּחָה Noun · feminine plural construct
of Merari מְרָרִי mĕrārî מְרָרִי Proper name

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