וַיִּבְחַ֨ר מֹשֶׁ֤ה אַנְשֵׁי־חַ֙יִל֙ מִכָּל־יִשְׂרָאֵ֔ל וַיִּתֵּ֥ן אֹתָ֛ם רָאשִׁ֖ים עַל־הָעָ֑ם שָׂרֵ֤י אֲלָפִים֙ שָׂרֵ֣י מֵא֔וֹת שָׂרֵ֥י חֲמִשִּׁ֖ים וְשָׂרֵ֥י עֲשָׂרֹֽת׃
And Moses chose able men out of all Israel, and made them heads over the people, rulers of thousands, rulers of hundreds, rulers of fifties, and rulers of tens.
Read halakhic rulings (Jewish law) on Exodus 18:25: and classical halakhic sources.