וַיְצַ֤ו לָהֶם֙ מֹשֶׁ֔ה אֵ֚ת אֶלְעָזָ֣ר הַכֹּהֵ֔ן וְאֵ֖ת יְהוֹשֻׁ֣עַ בִּן־נ֑וּן וְאֶת־רָאשֵׁ֛י אֲב֥וֹת הַמַּטּ֖וֹת לִבְנֵ֥י יִשְׂרָאֵֽל׃
So Moses gave charge concerning them to Eleazar the priest, and to Joshua the son of Nun, and to the heads of the fathers’houses of the tribes of the children of Israel.
Read halakhic rulings (Jewish law) on Numbers 32:28: and classical halakhic sources.