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 sons of Aaron were anointed and ordained to minister as priests.
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But Nadab and Abihu died in the LORD ’s presence in the wilderness of Sinai when they burned before the LORD the wrong kind of fire, different than he had commanded. Since they had no sons, this left only Eleazar and Ithamar to serve as priests with their father, Aaron.