so that, having been purified, they might enter to their duties in the tabernacle of the covenant before Aaron and his sons. Just as the Lord had instructed Moses about the Levites, so was it done
Other versions
King James Version
And after that went the Levites in to do their service in the tabernacle of the congregation before Aaron, and before his sons: as the LORD had commanded Moses concerning the Levites, so did they unto them.English Standard Version
And after that the Levites went in to do their service in the tent of meeting before Aaron and his sons; as the LORD had commanded Moses concerning the Levites, so they did to them.New International Version
After that, the Levites came to do their work at the Tent of Meeting under the supervision of Aaron and his sons. They did with the Levites just as the LORD commanded Moses.