Numbers 8:11-13

EJ2000(i) 11 and Aaron shall offer the Levites before the LORD for a wave offering of the sons of Israel, and they shall serve in the ministry of the LORD. 12 And the Levites shall lay their hands upon the heads of the bullocks; and thou shalt offer the one as the sin, and the other as a burnt offering, unto the LORD, to reconcile the Levites. 13 And thou shalt cause the Levites to present themselves before Aaron, and before his sons, and offer them for an offering unto the LORD.