וַיִּקַּ֨ח מֹשֶׁ֜ה מִשֶּׁ֣מֶן הַמִּשְׁחָ֗ה וּמִן־הַדָּם֮ אֲשֶׁ֣ר עַל־הַמִּזְבֵּחַ֒ וַיַּ֤ז עַֽל־אַהֲרֹן֙ עַל־בְּגָדָ֔יו וְעַל־בָּנָ֛יו וְעַל־בִּגְדֵ֥י בָנָ֖יו אִתּ֑וֹ וַיְקַדֵּ֤שׁ אֶֽת־אַהֲרֹן֙ אֶת־בְּגָדָ֔יו וְאֶת־בָּנָ֛יו וְאֶת־בִּגְדֵ֥י בָנָ֖יו אִתּֽוֹ׃
Luego tomó Moisés del aceite de la unción, y de la sangre que estaba sobre el altar, y roció sobre Aarón, y sobre sus vestiduras, sobre sus hijos, y sobre las vestiduras de sus hijos con él; y santificó á Aarón, y sus vestiduras, y á sus hijos, y las vestiduras de sus hijos con él.
Rabbeinu Bahya
ויפשט משה את אהרון את בגדיו, “Moses stripped Aaron’s garments from him;” he removed the garments he wore in his capacity of High Priest and gave them to Eleazar his son in his presence. At this point Moses took back what he had given Aaron, i.e. the clothes, as we know from Leviticus 8,7, and G’d took back what He had given Aaron, i.e. his soul. Moses instructed Aaron to enter a cave in that mountain and Aaron entered it. He saw that a bed stood all prepared with fresh linen and that a light was burning beside it. Moses told Aaron to lie on the bed and Aaron complied. He then told him to stretch out his hands and Aaron did so. He told him to close his mouth and Aaron did so. He then told Aaron to close his eyes. Aaron complied. At that point Moses became desirous of dying in the same manner that he observed his brother dying. This is the meaning of G’d saying to him in Deut. 32,3: “just like your brother Aaron died,” i.e. the kind of death you wished for yourself.
The sages in Torat Kohanim (96,130) explain that some miraculous events took place with Aaron’s priestly garments. Under normal circumstances outer garments remain outer garments and underwear remains underwear. Moses undressed Aaron in the same order in which he had originally dressed him (compare similarities in the wording here and in Leviticus 8,7) in a miraculous manner to show G-d's honor of Aaron in death even more than during his lifetime.
The sages in Torat Kohanim (96,130) explain that some miraculous events took place with Aaron’s priestly garments. Under normal circumstances outer garments remain outer garments and underwear remains underwear. Moses undressed Aaron in the same order in which he had originally dressed him (compare similarities in the wording here and in Leviticus 8,7) in a miraculous manner to show G-d's honor of Aaron in death even more than during his lifetime.