1 Chronicles 24:1-3

Living Bible

24 ^1-2 The priests (the descendants of Aaron) were placed into two divisions named after Aaron’s sons, Eleazar and Ithamar.

Nadab and Abihu were also sons of Aaron, but they died before their father did and had no children; so only Eleazar and Ithamar were left to carry on. ³ David consulted with Zadok, who represented the Eleazar clan, and with Ahimelech, who represented the Ithamar clan; then he divided Aaron’s descendants into many groups to serve at various times.