1 Chronicles 23:5

וַיִּסָּֽפְרוּ הַלְוִיִּם מִבֶּן שְׁלֹשִׁים שָׁנָה וָמָעְלָה וַיְהִי מִסְפָּרָם לְגֻלְגְּלֹתָם לִגְבָרִים שְׁלֹשִׁים וּשְׁמוֹנָה אָֽלֶף

And the Levites were numbered from thirty years old and upward; and their number by their polls, man by man, was thirty and eight thousand.

מֵאֵלֶּה לְנַצֵּחַ עַל־מְלֶאכֶת בֵּית־יְהוָה עֶשְׂרִים וְאַרְבָּעָה אָלֶף וְשֹׁטְרִים וְשֹׁפְטִים שֵׁשֶׁת אֲלָפִֽים

Of these, twenty and four thousand were to oversee the work of the house of the LORD; and six thousand were officers and judges;

וַיֶּֽחָלְקֵם דָּוִיד מַחְלְקוֹת לִבְנֵי לֵוִי לְגֵרְשׁוֹן קְהָת וּמְרָרִֽי

And David divided them into courses according to the sons of Levi: Gershon, Kohath, and Merari.

לַגֵּרְשֻׁנִּי לַעְדָּן וְשִׁמְעִֽי

Of the Gershonites: Ladan, and Shimei.