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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This is what you must do so they will live and not die when they approach the most sacred objects. Aaron and his sons must always go in with them and assign a specific duty or load to each person.
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The Kohathites must never enter the sanctuary to look at the sacred objects for even a moment, or they will die.”