Numbers 3:44-46

Young's Literal Translation

⁴⁴ And Jehovah speaketh unto Moses, saying,

⁴⁵ `Take the Levites instead of every first-born among the sons of Israel, and the cattle of the Levites instead of their cattle; and the Levites have been Mine; I [am] Jehovah.

⁴⁶ `And [from] those ransomed of the two hundred and seventy and three (who are more than the Levites) of the first-born of the sons of Israel,