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.
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The Levites, too, purified themselves from sin and washed their clothes; and Aaron presented them as a wave offering before the LORD . Aaron also made atonement for them to cleanse them.
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Then after that the Levites went in to perform their service in the tent of meeting before Aaron and before his sons; just as the LORD had commanded Moses concerning the Levites, so they did to them.