¹⁷ For all the firstborn males among the people of Israel are mine, both of people and of animals. I set them apart for myself on the day I struck down all the firstborn sons of the Egyptians. ¹⁸ Yes, I have claimed the Levites in place of all the firstborn sons of Israel. ¹⁹ And of all the Israelites, I have assigned the Levites to Aaron and his sons. They will serve in the Tabernacle on behalf of the Israelites and make sacrifices to purify^[a] the people so no plague will strike them when they approach the sanctuary.”