Commento su Levitico 21:10

לא יפרע [THE HAIR OF HIS HEAD] SHALL HE NOT DISARRANGE — i.e. he shall not let his hair grow wild on account of ritual mourning for the death of a near relative (Sifra). And what is called "letting the hair grow wild”? Leaving it uncut for more than 30 days (Sanhedrin 22b).

HE SHALL NOT LET THE HAIR OF HIS HEAD GO LOOSE etc. 11. NEITHER SHALL HE GO IN TO ANY DEAD BODY. The phrase [dealing with his hair, in Verse 10], is connected with any dead body in the following verse, thus stating that the High Priest is not to let his hair go loose nor rend his garments for any dead body, neither is he to enter a tent where there is a corpse.

It shall not grow wild in mourning. As we learn from the sons of Aharon where it is written (Vayikra 10:6), “Do not let your hair grow long (תפרעו),” just as over there [it refers to someone] in mourning, so here [it refers to someone] in mourning. And what is [the definition of] growing [hair] wild? [Leaving it uncut for] more than thirty days as we learn from the [laws of] nazir of whom it is written, “He shall let (יהיה) the hair of his head grow long; the gematria of יהיה is thirty.

את ראשו לא יפרע ובגדיו לו יפרום , “he must not let hishair grow wild, nor must he rend his garments” (as a means of showing the world that he is in mourning). He must not neglect his dignified appearance, even when in mourning.

That is that He commanded us that we have oil made according to the special recipe, ready to anoint the high priest when he is appointed - as He said, "The priest who is exalted above his fellows, on whose head the anointing oil has been poured" (Leviticus 21:10). And some of the kings were [also] anointed with it, as it is explained in the the law of this commandment. And the Tabernacle and all of its vessels have already been anointed by it. The vessels are not anointed for [all of the] generations (when new ones are made). For they said in the explanation, in the Sifrei (Sifrei Bamidbar 44), "That with the anointment of these" - meaning the vessels of the Tabernacle - "all the future vessels were consecrated." He, may He be elevated and may His name be blessed, said, "This shall be an anointing oil sacred to Me throughout the ages" (Exodus 30:31). And the regulations of this commandment have already been explained in the first chapter of Keritot. (See Parasht Ki Tissa; Mishneh Torah, Vessels of the Sanctuary and Those who Serve Therein 1.)