And Nadab and Abihu died before the LORD, when they offered unholy fire before the LORD, in the wilderness of Sinai, and they had no children: and Eleazar and Ithamar ministered in the priest's office in the sight of Aaron their father.
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George Leo Haydock
Presence; or as it is expressed, (1 Paralipomenon xxiv. 9,) under the hand of Aaron, by his direction, and in quality of his assistant, (Calmet) while he lived, Eleazar succeeded him in the high priesthood; (Josue xxiv. 33,) and his children possessed that dignity, till the posterity of Ithamar came in under Heli, chap. xxv. 13. (Haydock)