1 Chronicles 24:5 "They divided them by lot, all alike, for there were sacred officers and officers of God among both the sons of Eleazar and the sons of Ithamar."
1 Chronicles 24:1 - 31
ESV - 1 The divisions of the sons of Aaron were these. The sons of Aaron: Nadab, Abihu, Eleazar, and Ithamar. 2 But Nadab and Abihu died before their father and had no children, so Eleazar and Ithamar became the priests.
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.