Numbers 8:6

4This was the workmanship of the lamp stand, beaten work of gold. From its base to its flowers, it was beaten work. He made the lamp stand according to the pattern which the LORD had shown Moses.

5The LORD spoke to Moses, saying,

6“Take the Levites from among the children of Israel, and cleanse them.

7You shall do this to them to cleanse them: sprinkle the water of cleansing on them, let them shave their whole bodies with a razor, let them wash their clothes, and cleanse themselves.

8Then let them take a young bull and its meal offering, fine flour mixed with oil; and another young bull you shall take for a sin offering.