כָּל־פְּקוּדֵ֨י הַלְוִיִּ֜ם אֲשֶׁר֩ פָּקַ֨ד מֹשֶׁ֧ה וְׄאַׄהֲׄרֹ֛ׄןׄ עַל־פִּ֥י יְהוָ֖ה לְמִשְׁפְּחֹתָ֑ם כָּל־זָכָר֙ מִבֶּן־חֹ֣דֶשׁ וָמַ֔עְלָה שְׁנַ֥יִם וְעֶשְׂרִ֖ים אָֽלֶף׃ (ס)
All that were numbered of the Levites, whom Moses and Aaron numbered at the commandment of the LORD, by their families, all the males from a month old and upward, were twenty and two thousand.
Read halakhic rulings (Jewish law) on Numbers 3:39: and classical halakhic sources.