Numbers 1:50

50 Appoint the Levites over the tabernacle of the
testimony: A reference to either the Mosaic law in general or to a specific section of the law, the Ten Commandments, which were written on stone tablets and placed in the ark of the covenant (also called the ark of the testimony)
testimony, all its furnishings, and everything in it. They are to transport the tabernacle and all its articles, take care of it, and camp around it.
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