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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Those were the names of Aaron's sons. They were the anointed priests. They were prepared to serve the LORD as priests.
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But Nadab and Abihu made an offering to the LORD by using fire that wasn't allowed. So they fell dead in front of him. That happened in the Desert of Sinai. They didn't have any sons. Only Eleazar and Ithamar served as priests while their father Aaron was living.