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Numbers 4:15
And when Aaron and his sons have made an end of covering the sanctuary, and all the vessels of the sanctuary, as the camp is to set forward; after that, the sons of Kohath shall come to bear it: but they shall not touch any holy thing, lest they die. These things are the burden of the sons of Kohath in the tabernacle of the congregation. (Numbers 4:15)
After that.
 No Levite was allowed to touch the holy things until they had been covered and packed by Aaron and his priests; the Kohathites would then simply lift up the bundles and transport them (vs. 12-14).
To bear it.
 The Levites were the regular porters (2 Sam. 15:24). Upon two unusual occasions other arrangements were made (1 Sam. 6:8; 2 Sam. 6:3).
Touch any holy thing.
The word translated “holy thing” is probably a collective term referring to all the sacred objects.