בְּנֵ֥י מְרָרִ֖י מַחְלִ֣י וּמֻשִׁ֑י וְאֵ֛לֶּה מִשְׁפְּח֥וֹת הַלֵּוִ֖י לַאֲבוֹתֵיהֶֽם׃
The sons of Merari: Mahli, and Mushi. And these are the families of the Levites according to their fathers’houses.
Read kabbalistic (mystical) interpretation of I Chronicles 6:4: and classical mystical sources.