Numbers 3:20 KJV

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.

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...

Exodus 6:19 And the sons of Merari; Mahali and Mushi: these are the families of Levi according to their generations.
1 Chronicles 6:19 The sons of Merari; Mahli, and Mushi. And these are the families of the Levites according to their fathers.
Numbers 3:33 Of Merari was the family of the Mahlites, and the family of the Mushites: these are the families of Merari.
1 Chronicles 6:29 The sons of Merari; Mahli, Libni his son, Shimei his son, Uzza his son,
1 Chronicles 6:44–47 And their brethren the sons of Merari stood on the left hand: Ethan the son of Kishi, the son of Abdi, the son of Malluch, …
1 Chronicles 15:6 Of the sons of Merari; Asaiah the chief, and his brethren two hundred and twenty:
1 Chronicles 23:21–23 The sons of Merari; Mahli, and Mushi. The sons of Mahli; Eleazar, and Kish. …
1 Chronicles 24:27–30 The sons of Merari by Jaaziah; Beno, and Shoham, and Zaccur, and Ibri. …
1 Chronicles 25:3 Of Jeduthun: the sons of Jeduthun; Gedaliah, and Zeri, and Jeshaiah, Hashabiah, and Mattithiah, six, under the hands of their father Jeduthun, who prophesied with a harp, to give thanks and to praise the LORD.

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...
MushiReceding, the second of the two sons of Merari (Ex 6:19; Num 3:20). His sons were called Mushites (Num 3:33; Num 26:58).

And the sons וּבְנֵי ûbĕnê בֵּן Noun · masculine plural construct · with and
of Merari מְרָרִי mĕrārî מְרָרִי Proper name
by their families לְמִשְׁפְּחֹתָם lĕmišpĕḥōtām מִשְׁפָּחָה Noun · feminine plural construct · with preposition, suffix: third person masculine plural
Mahli מַחְלִי maḥlî מַחְלִי Proper name
and Mushi וּמוּשִׁי ûmûšî מוּשִׁי Proper name · with and
These אֵלֶּה ʾēllê Pronoun הֵם hēm הֵם Pronoun · third person masculine plural
the families מִשְׁפְּחֹת mišpĕḥōt מִשְׁפָּחָה Noun · feminine plural construct
of the Levites הַלֵּוִי hallēwî לֵוִיִּי Noun · masculine singular · with the
according to the house לְבֵית lĕbêt בַּיִת Noun · masculine singular construct · with preposition
of their fathers אֲבֹתָם ʾăbōtām אָב Noun · masculine plural construct · with suffix: third person masculine plural

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