מדרש אויף במדבר 20:28

6) (Vayikra 8:7) "And he put upon him the kutoneth and he girded him with the avneit, etc." (See Shemoth 29): We are hereby taught that Moses was made an aid to Aaron. And just as he was made his aid in his lifetime, so, he was made his aid in his death. And he would dress him and he would undress him, as it is written (Bamidbar 20:25): "Take Aaron and Elazar his son… (Bamidbar 20:26) and strip Aaron of his vestments, etc." And whence is it derived that Moses did this? From (Bamidbar 20:27): "And Moses did as the L–rd commanded, and they went up to Hor Hahar … (Bamidbar 20:28) and Moses stripped Aaron of his vestments." Now how could Moses strip his vestments in order and dress Elazar in order. Do not the outer garments remain outer garments, and the inner garments remain inner garments? (i.e., We see from Scripture that Aaron did not die until he saw Elazar dressed in the priestly vestments. Is it possible that Aaron stood naked until Elazar donned all the eight vestments?) This transpired miraculously. Variantly: The Holy One Blessed be He accorded him greater honor in his death than in his life. Moses stood him on a rock and stripped him of his priestly vestments, and vestments of the Shechinah clothed him in their stead. Moses stripped his vestments (in order) and clothed Elazar with them in order.

(Numb. 20:22:) “Then setting out from Kadesh, the whole congregation [of the Children of Israel came to Mount Hor].” This text is related (to II Chron. 20:37), “Because you have joined with Ahaziah,¹⁰⁸Son of Ahab and a wicked king of Israel (I Kings 22:51-52), with whom Jehoshaphat had allied himself (I Kings 22:44; II Chron. 20:35.) the Lord will destroy your work.” [Similarly,] because they made an alliance with this wicked king to pass through his land, they lost this righteous man (i.e., Aaron).¹⁰⁹Numb. R. 19:16. For that reason the death of Aaron¹¹⁰See Numb. 20:28: … AND AARON DIED THERE ON THE TOP OF THE MOUNTAIN. is made [immediately] adjacent after the parashah about the king of Edom, [as stated] (Numb. 20:21-22), “so Israel turned away from them. Then setting out from Kadesh, the whole congregation [of the Children of Israel came to Mount Hor].”¹¹¹Cf. yYoma 1:1 (38ab). What is the meaning of “the whole congregation?” A complete congregation, a congregation which would be entering the land, since those who had come out from Egypt had died. So these were the ones of whom it is written (in Deut. 4:4), “But you who clung to the Lord your God are all alive today.” (Numb. 20:22:) “Mount (hr) Hor (hr).” What is the meaning of “Mount Hor?” A mountain (hr) on top of a mountain (hr), like a small apple on a large apple. Even though a cloud proceeded before them which lowered the high [places] and raised up the low, the Holy One, blessed be He, left [this] mountain as a sample,¹¹²Gk.: deigma. so that they would know what miracles the Holy One, blessed be He, had done for them; as He had not left a mountain in the desert, lest they become weary climbing and descending. Moreover, although the cloud had made all the desert a plain, He left an elevated spot where the tabernacle would have its resting place. He also left three mountains: Mount Sinai for the Divine Presence, Mount Nebo for the burial of Moses, and Mount Hor for the burial of Aaron.

(Numb. 20:25-26:) “Take Aaron [and his son Elazar] […,] And strip Aaron.” The Holy One, blessed be He, said to Moses, “See, you may console him that he is bequeathing his crown to his sons. [This is] something that you are not bequeathing to your [own] children.” (Numb. 20:28:) “So Moses stripped Aaron of his vestments and put them [on his son Elazar].” But if the high priest leaves the Temple mount in priestly vestments, does he not receive forty lashes, since [these vestments] are [made of] wool and flax?¹¹⁷Cf. Deut. 22:11, which forbids the mixture, and Kil. 9:1, which allows robes of this mixture for priests when they minister in the Temple. Cf. also Yoma 72a, according to which the forty lashes are for one who tears a priestly garment. However, [Scripture serves] to inform you that, with the wording by which he inducted him into the priesthood, when [the Holy One, blessed be He,] said to [Moses] (in Lev. 8:2), “Take Aaron,” with this very wording He also said to him (in Numb. 20:25), “Take Aaron.” (Numb. 20:27:) “So Moses did as the Lord commanded....” [This verse serves] to teach you that, even though He had spoken a decree against his brother, he did not hesitate.¹¹⁸See below, Numb. 6a:2. (Numb. 20:29:) “Then all the congregation saw that Aaron had died.” When Moses and Elazar came down [from the mountain], the whole congregation assembled themselves against them and said, “Where is Aaron?”¹¹⁹Numb. R. 19:20. They said to them, “He is dead.” They said to them, “How could the angel of death hurt him, a man who has halted the angel of death and held him back?” It is so stated (in Numb. 17:13), “So he (i.e., Aaron) stood between the dead and the living, and the plague was halted.” They said to them, “If you bring him [back], well and good; but if not, we will stone you [to death].” At that time Moses rose in prayer. He said, “Master of the world, bring us out from [this] suspicion.” Immediately the Holy One, blessed be He, opened the [burial] cave and showed him to [the congregation] for them. It is so stated (in Numb. 20:29), “Then all the congregation saw that Aaron had died.”