Numbers 3:41, 45

You shall take the Levites for Me instead of and as a substitute for all the firstborn among the Israelites. I am the LORD; and you shall take the cattle of the Levites instead of and as a substitute for all the firstborn among the cattle of the Israelites.”

“Take the Levites [for Me] instead of all the firstborn among the sons of Israel, and the cattle of the Levites instead of their cattle. And the Levites shall be Mine. I am the LORD.