Numbers 4:4

4. In the tabernacle Into the holy of holies, where God met the high priest, no other person was permitted to go. But it was the office of the Kohathites to transport and have the charge of the sacred furniture contained therein when wrapped up by Aaron and his sons.

The most holy things Hebrew, holiness of holiness, a form of Hebrew superlative. There is no need of the English preposition about. “The most holy things” are the grammatical appositive of tabernacle; the container is put for the contained, such as the ark of the covenant, the golden altar, the table of show-bread, and the candlestick. These were not to be touched, nor even seen, till wrapped up by the priests in the manner prescribed in the following verses. Eleazar, the elder of Aaron’s living sons, was charged with the preparation of these burdens of the Kohathites. See Numbers 4:16.