I Chronicles 12:28 Kabbalah

וִיהוֹיָדָ֖ע הַנָּגִ֣יד לְאַהֲרֹ֑ן וְעִמּ֕וֹ שְׁלֹ֥שֶׁת אֲלָפִ֖ים וּשְׁבַ֥ע מֵאֽוֹת׃ (ס)

And Jehoiada was the leader of the house of Aaron, and with him were three thousand and seven hundred;