To Aaron were born Nadab and Abihu, Eleazar and Ithamar.
Referenced Verses
Num 3:2 : 2 These are the names of the sons of Aaron: Nadab the firstborn, and Abihu, Eleazar, and Ithamar.
Num 3:8 : 8 They shall keep all the furnishings of the Tent of Meeting, and the obligations of the children of Israel, to do the service of the tabernacle.