A dramatic transition marks the history of the Israelites as they leave behind their years of wandering in the desert. They now stand as a new, complete generation ready to enter the Promised Land, just moments before they must part with Aaron. The entire nation arrives at their next destination together, a detail that carries deep significance. The primary approach among commentators is that this collective arrival reflects a state of both spiritual and physical wholeness [רש״י, שפתי חכמים, ברטנורא, צאינה וראינה, גור אריה, רש ר הירש]. The older generation, which was destined to pass away in the wilderness, is gone. The people standing together now are those who have been granted life, are destined to enter the land, and are worthy of the World to Come. Furthermore, their departure from Kadesh hints that the nation was now sanctified and entirely cleansed of sin [שפתי כהן].
Other commentators view this unified arrival through the lens of recent challenges. Even though the king of Edom had just confronted them with a heavy military force, not a single Israelite was killed or went missing; they all arrived safely and unharmed [רבנו בחיי, אבן עזרא, חזקוני, מלבי״ם]. Additionally, this moment highlights a profound sense of national unity. Not a single person chose to abandon the group to settle along the border of Edom. Instead, everyone continued the journey together alongside Moses and Aaron [העמק דבר].
Their journey brings them to Mount Hor. Some explain that "Hor" is simply the specific name of the mountain, called so because it stood out prominently against the local landscape [ביאור יש״ר, ביאור שטיינזלץ, נתינה לגר, ברכת אשר]. Conversely, another approach describes a highly unusual natural formation: a mountain resting on top of another mountain, much like a small apple sitting on top of a larger one. According to this tradition, the protective clouds that traveled ahead of the camp usually flattened the terrain to make walking easier for the people. However, God intentionally left three mountains standing tall for historical purposes: Mount Sinai for the giving of the Torah, Mount Hor for the burial of Aaron, and Mount Nebo for the burial of Moses [רש״י, רבנו בחיי, רש ר הירש, ברכת אשר].
Reaching this specific mountain signals the end of Aaron's lifelong duty. Because the Israelites had successfully escaped the threat of Edom, they no longer required Aaron's spiritual protection against that danger [שפתי כהן]. To comfort Aaron and spare him the sadness of thinking he was dying solely because of the recent sin involving the water in the desert, God chose not to inform him of his passing directly. Instead, God sent Moses to deliver the news gently. Moses conveyed a reassuring message: Aaron's passing was not a sudden, premature punishment. Rather, it was a natural and honorable gathering to his people, where the souls of the righteous were waiting to welcome him with joy in the true world [אלשיך].