Numbers 8:6

8:6 “Take the Levites from among the Israelites and purify ¹  them.

[8:6]  ¹ tn The verb טָהַר (tahar) means that Moses was “to purify” or “to make ceremonially clean” the Levites so that they could enter the sanctuary and do the work prescribed for them. Whatever is “unclean” is not permitted in the sanctuary at all.