Numbers 8:19

19And I have given the Levites as 8:19 Lit given onesa gift to Aaron and to his sons from among the sons of Israel, to perform the service of the sons of Israel at the tent of meeting and to make atonement on behalf of the sons of Israel, so that there will be no affliction among the sons of Israel due to 8:19 Lit the sons of Israel’stheir approaching the sanctuary.”