Rashi on Numbers 4:20/רש"י על במדבר ד׳:כ׳

1ולא יבאו לראות כבלע את הקדש BUT THEY SHALL NOT COME IN TO SEE WHEN THE HOLY THINGS ARE WRAPPED IN, each into its wrapping, as I have explained above in this section (v. 5 ff.): ‘‘and they shall spread upon it such-and-such a garment”, “and they shall cover it over with such-and-such a cover”, — for the “wrapping-up’ of it mentioned here is identical with the “covering up” of it mentioned in those passages.