And the Lord spake unto Moses At the same time he gave the instructions about the consecration of the Levites, the time of their entrance on their service, and of leaving it, was fixed: saying; as follows.
21
The Levites purified themselves and washed their clothes, and Aaron presented them as a wave offering before the LORD. Aaron also made atonement for them to cleanse them.
22
After that, the Levites came to perform their service at the Tent of Meeting in the presence of Aaron and his sons. Thus they did with the Levites just as the LORD had commanded Moses.