1 Chronicles 24:2

2 But Nadab and Abihu died before their father did, and they had no sons; so Eleazar and Ithamar served as the priests.

Read 1 Chronicles 24:2 Using Other Translations

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, so Eleazar and Ithamar became the priests.
But Nadab and Abihu died before their father, and they had no sons. So only Eleazar and Ithamar were left to carry on as priests.