And the Lord spake unto Moses Though Aaron is not mentioned here, he was concerned in taking the sum of the Gershonites, as well as of the Kohathites, as appears from ( Numbers 4:41 ) ;
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but do this in regard to them, that they may live and not die when they approach the most holy things: Aaron and his sons shall go in and appoint each of them to his service and his task.
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But they shall not go in to watch while the holy things are being covered, lest they die."
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"Also take a census of the sons of Gershon, by their fathers' house, by their families.
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From thirty years old and above, even to fifty years old, you shall number them, all who enter to perform the service, to do the work in the tabernacle of meeting.