Numbers 8:7-8

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. {let them shave...: Heb. let them cause a razor to pass over, etc} 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.