Numbers 8:6-8

Young's Literal Translation

⁶ `Take the Levites from the midst of the sons of Israel, and thou hast cleansed them.

⁷ `And thus thou dost to them to cleanse them: sprinkle upon them waters of atonement, and they have caused a razor to pass over all their flesh, and have washed their garments, and cleansed themselves,

⁸ and have taken a bullock, a son of the herd, and its present, flour mixed with oil, -- and a second bullock a son of the herd thou dost take for a sin-offering,