Numbers 8:6-8

New Revised Standard Version, Anglicised Catholic Edition

⁶ Take the Levites from among the Israelites and cleanse them. ⁷ Thus you shall do to them, to cleanse them: sprinkle the water of purification on them, have them shave their whole body with a razor and wash their clothes, and so cleanse themselves. ⁸ Then let them take a young bull and its grain-offering of choice flour mixed with oil, and you shall take another young bull for a sin-offering.