Numbers 8:19-21

Complete Jewish Bible

¹⁹ and I have given the L’vi’im to Aharon and his sons from among the people of Isra’el to do the service of the people of Isra’el in the tent of meeting and to make atonement for the people of Isra’el, so that no plague will fall on the people of Isra’el in consequence of their coming too close to the sanctuary.”

²⁰ This is what Moshe, Aharon and all the community of the people of Isra’el did to the L’vi’im. The people of Isra’el acted in accordance with everything that Adonai had ordered Moshe in regard to the L’vi’im. ²¹ The L’vi’im purified themselves and washed their clothes. Then Aharon offered them as a holy gift before Adonai and made atonement for them in order to cleanse them.