“These were the divisions of the descendants of Aaron: The sons of Aaron were Nadab, Abihu, Eleazar and Ithamar. But Nadab and Abihu died before their father did, and they had no sons; so Eleazar and Ithamar served as the priests.”

‭‭1 Chronicles‬ ‭24‬:‭1‬-‭2‬ ‭NIV‬‬

https://bible.com/bible/111/1ch.24.1-2.NIV