I Chronicles 12:4 Midrash

וְיִֽשְׁמַֽעְיָ֧ה הַגִּבְעוֹנִ֛י גִּבּ֥וֹר בַּשְּׁלֹשִׁ֖ים וְעַל־הַשְּׁלֹשִֽׁים׃

and Ishmaiah the Gibeonite, a mighty man among the thirty, and over the thirty;

Read midrashic interpretation of I Chronicles 12:4: and classical rabbinic exegesis.