‏ Numbers 7:9

9But to the sons of Kohath he gave no wagons or oxen, because they serve in the Sanctuary and they carry their burdens on their shoulders.
7:9The sons of Kohath were permitted to enter the Sanctuary, after all the articles had been wrapped, so as to carry these when the camp moved. They carried the ark of the covenant on their shoulders, by means of the gold covered bars.(Conte)
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