Numbers 3:44-46

Amplified Bible

⁴⁴ Then the Lord spoke to Moses, saying, ⁴⁵ “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. ⁴⁶ For the ransom (redemption price) of the 273 of the firstborn of the Israelites who outnumber the Levites,