Numbers 8:13 WBT

¹¹  And Aaron shall offer the Levites before the LORD [for] an offering of the children of Israel, that they may execute the service of the LORD.

¹²  And the Levites shall lay their hands upon the heads of the bullocks: and thou shalt offer the one [for] a sin-offering, and the other [for] a burnt-offering, to the LORD, to make an atonement for the Levites.

¹³  And thou shalt set the Levites before Aaron, and before his sons, and offer them [for] an offering to the LORD.

¹⁴  Thus shalt thou separate the Levites from among the children of Israel: and the Levites shall be mine.

¹⁵  And after that shall the Levites go in to perform the service of the tabernacle of the congregation: and thou shalt cleanse them, and offer them [for] an offering.