Comentario citado sobre Levítico 16:32

Seven days... We separate the High Priest. Since all the service of Yom Kippur is not kosher except through him [Yuma 32a and many other places], as it says in regard to Yom Kippur (Vaikra chapter 16) "And the Cohen ,who will be anointed with oil, will atone." [note of the translator: from this verse we see that only the anointed Cohen, i.e. High Priest can perform atonement service of Yom Kippur]. And this separation is learned out for us from what is written in regard to seven days of the dedication [of the Mishkan] (ibid. chapter 8) "And from the entrance of the Tent of Meeting don't go away for seven days", and after this it is written (ibid.) "Just like was done on this day commanded Hashem to do to atone for you", and the sages expound: [the phrase] "to do" this is doings of the cow [red heifer], [and the phrase] "to atone for you" this is doings of the Yom Kippur. Thus, the Cohen that burns the cow [red heifer] and the Cohen serving on Yom Kippur, both require separation from their houses for seven days just like were required Aharon and his sons during the seven days of dedication [of the Mishkan]. [note of the translator: thus, from the proximity of the two verses, the verse that talks about the seven days of separation during the dedication of the Mishkan and the verse that was expounded to mean "just like was done on this day, commended Hashem to do for the procedure of the Red heifer and the Yom Kippur service", the sages learn that the Cohen that does the burning of the red heifer and the High priest that serves on Yom Kippur should be separated from their houses similar to the seven day separation of the days of dedication of the Mishkan.]

Who can fill his position. . . [Rashi knows this] because in Vayikra 16:32 it is written ואשר ימלא את ידו , which teaches: when he can fill ( ממלא ) his father’s place, [he should be appointed].

And you shall make a partition curtain of blue, etc. This partition curtain that separates between the Holy and the Holy of Holies differs from the screen that separates between the Tent of Meeting and the courtyard of the Tabernacle in three ways:
1. The partition curtain was a “work of a skillful workman” with cherubs, while the screen was a work of an embroiderer.
2. The partition curtain was hung on four pillars, while the screen was on five pillars.
3. The partition curtain was on silver sockets, while the screen was on copper sockets.
This is because in the Holy of Holies, the priest was not permitted to enter except on the Day of Atonement, when Israel is compared to ministering angels called cherubs, as on that day the physical body is afflicted and it is as if it does not exist, leaving only the intellectual, thinking power which is called the work of a skillful workman. Therefore, this partition curtain was made as the work of a skillful workman with cherubim, so that whoever sees this partition would understand and realize that one has no permission to enter there except at a time when one resembles the cherubs — a work of a skillful workman [chashav, which can also mean thought].
Similarly, the angel is called clothed in linen (Ezekiel 9:3), just as the High Priest on the Day of Atonement was clothed in linen and white garments. Therefore, it was on silver sockets, because all silver is white, indicating the forgiveness of the Day of Atonement, when sins will be made as white as snow. At that time, the priest would serve wearing the four white garments mentioned in the portion of Acharei Mot.
This explanation is reasonable to consider — that the appearance and features of the partition curtain indicate what it separates, for whoever sees it understands through its symbolic hints what it represents.