שמות כט:ל פירוש: רש״י, רשב״ם, Siftei Chakhamim וRav Hirsch

שבעת ימים SEVEN DAYS in succession, on such a High Priest’s installation,

ילבשם הכהן, the newly appointed High Priest is to wear them prior to his being inaugurated.

[They must be] consecutive. [Rashi knows this] because otherwise, why does it say “seven days”? A Kohein Gadol must wear these garments every time he serves, after which he removes them [until the next time]. Perforce, it refers to his seven days of installation — which are consecutive.