Numbers 3:18 Midrash

וְאֵ֛לֶּה שְׁמ֥וֹת בְּֽנֵי־גֵרְשׁ֖וֹן לְמִשְׁפְּחֹתָ֑ם לִבְנִ֖י וְשִׁמְעִֽי׃

And these are the names of the sons of Gershon by their families: Libni and Shimei.

Read midrashic interpretation of Numbers 3:18: and classical rabbinic exegesis.