Following the tragic events of the spies and the intense debate over the destiny of the nation, the nature of the divine dialogue undergoes a significant shift. The decree against the people is finalized, and it must now move from a private conversation into the public sphere. This transition requires a renewed and focused address to the leaders of the nation. The primary approach among commentators is that up until this moment, the communication was a private consultation between God and Moses. It was a general discussion about the impending decree, much like a king sharing his plans with a trusted servant [אור החיים, העמק דבר, רש ר הירש]. Now, the speech transforms into an official mission meant to be delivered directly to the Israelites.
In this new stage, God outlines the exact details of the punishment. This ensures that the people do not mistakenly believe they have escaped consequence simply because they did not suffer immediate death [ביאור יש״ר]. Furthermore, Aaron is now brought into the conversation alongside Moses. His inclusion is directly tied to the fact that both leaders previously fell on their faces together in a desperate plea before the nation [הטור הארוך]. Because they were appointed to lead as a pair, they now bear the heavy, shared burden of helping the people understand and internalize this tragic change in their destiny [רש ר הירש].
Alternatively, another perspective suggests that including both leaders serves to protect their honor. God wants to reassure them that while they too will eventually pass away in the wilderness, their passing will be entirely different from the grim fate of the spies and the sinful generation. Their spiritual standing remains completely intact and secure [אלשיך]. Even so, despite both men being addressed, the practical instructions and the core prophetic message are primarily directed at Moses, acknowledging his role as the senior prophet [הטור הארוך].