Numbers 8:5-8 King James Version (KJV)
5 And the Lord spake unto Moses, saying,
6 Take the Levites from among the children of Israel, and cleanse them.
7 And thus shalt thou do unto them, to cleanse them: Sprinkle water of purifying upon them, and let them shave all their flesh, and let them wash their clothes, and so make themselves clean.
8 Then let them take a young bullock with his meat offering, even fine flour mingled with oil, and another young bullock shalt thou take for a sin offering.