Numbers 8:7

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.

⁹  And thou shalt bring the Levites before the tabernacle of the congregation: and thou shalt gather the whole assembly of the children of Israel together: