Numbers 8:15-17

New American Standard Bible

¹⁵ Then after that the Levites may go in to serve the tent of meeting. But you shall cleanse them and ^(A)present them as a wave offering; ¹⁶ for they are ^(B)exclusively given to Me from among the sons of Israel. I have taken them for Myself ^(C)instead of the firstborn of every womb, the firstborn of all the sons of Israel. ¹⁷ For ^(D)every firstborn among the sons of Israel is Mine, among the people and among the animals; on the day that I fatally struck all the firstborn in the land of Egypt, I sanctified them for Myself.