I Chronicles 15:7 Midrash

לִבְנֵ֖י גֵּרְשׁ֑וֹם יוֹאֵ֣ל הַשָּׂ֔ר וְאֶחָ֖יו מֵאָ֥ה וּשְׁלֹשִֽׁים׃ (ס)

of the sons of Gershom: Joel the chief, and his brethren a hundred and thirty;

Read midrashic interpretation of I Chronicles 15:7: and classical rabbinic exegesis.