1 Chronicles 24:2

And Nadab and Abiud died before their father, and they had no sons: so Eleazar and Ithamar the sons of Aaron ministered as priests.

But Nadab and Abihu died before their father, and had no children: therefore Eleazar and Ithamar executed the priest’s office.

But Nadab and Abihu died before their father, and had no children; therefore Eleazar and Ithamar served as priests.