Numbers 8:7-9

New Revised Standard Version, Anglicised Catholic Edition

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. ⁹ You shall bring the Levites before the tent of meeting, and assemble the whole congregation of the Israelites.