Numbers 8:11-15
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11Aaron then shall present the Levites before the Lord as a wave offering from the sons of Israel, so that they may qualify to perform the service of the Lord. 12Now the Levites shall lay their hands on the heads of the bulls; then you are to offer the one as a sin offering and the other as a burnt offering to the Lord, to make atonement for the Levites. 13And you shall have the Levites stand before Aaron and his sons so as to present them as a wave offering to the Lord.
14“So you shall single out the Levites from among the sons of Israel, and the Levites shall be Mine. 15Then after that the Levites may go in to serve the tent of meeting. But you shall cleanse them and present them as a wave offering;