And the Lord spake unto Moses After he had given him the order for the numbering the children of Israel, and for the manner of their encampment and journeying:
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These are the names of Aaron's sons, the anointed priests, who were ordained to serve as priests.
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But Nadab and Abihu died in the Lord's presence when they presented unauthorized fire before the Lord in the Wilderness of Sinai, and they had no sons. So Eleazar and Ithamar served as priests under the direction of Aaron their father.