קַ֣ח אֶת־הַלְוִיִּ֗ם תַּ֤חַת כָּל־בְּכוֹר֙ בִּבְנֵ֣י יִשְׂרָאֵ֔ל וְאֶת־בֶּהֱמַ֥ת הַלְוִיִּ֖ם תַּ֣חַת בְּהֶמְתָּ֑ם וְהָיוּ־לִ֥י הַלְוִיִּ֖ם אֲנִ֥י יְהוָֽה׃
’Take the Levites instead of all the first-born among the children of Israel, and the cattle of the Levites instead of their cattle; and the Levites shall be Mine, even the LORD’S.
Read halakhic rulings (Jewish law) on Numbers 3:45: and classical halakhic sources.