וְהַ֨לְוִיִּ֔ם לֹ֣א הָתְפָּקְד֔וּ בְּת֖וֹךְ בְּנֵ֣י יִשְׂרָאֵ֑ל כַּאֲשֶׁ֛ר צִוָּ֥ה יְהוָ֖ה אֶת־מֹשֶֽׁה׃
But the Levites were not numbered among the children of Israel; as the LORD commanded Moses.
Read halakhic rulings (Jewish law) on Numbers 2:33: and classical halakhic sources.