Numbers 3:2

3:2 These are the names of the sons of Aaron: Nadab, the firstborn, and Abihu, Eleazar, and Ithamar.

Numbers 3:46

3:46 And for the redemption of the 273 firstborn males of the Israelites who exceed the number of the Levites,

Numbers 3:50

3:50 From the firstborn males of the Israelites he collected the money, 1,365 shekels, according to the sanctuary shekel.