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 were Aaron’s sons, the anointed priests, who were ordained to serve as priests.
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Nadab and Abihu, however, died in the presence of the LORD when they offered unauthorized fire before the LORD in the Wilderness of Sinai. And since they had no sons, only Eleazar and Ithamar served as priests during the lifetime of their father Aaron.