Numbers 8:7 WEB

⁵  Yahweh spoke to Moses, saying,

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

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

⁸  Then 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.

⁹  You shall present the Levites before the Tent of Meeting. You shall assemble the whole congregation of the children of Israel.