במדבר, פרק ט״ז, פסוק ט״ז

After human persuasion fails, Moses elevates the confrontation with Korah to a final, decisive stage. The dispute moves from a public argument to a direct, visible divine judgment. Because the rebels suspect Moses of acting on his own authority, no human proof will satisfy them. Only God's direct legal ruling can determine who is permitted to approach the holy [תורה תמימה, העמק דבר, ספורנו, רש״ר הירש]. At the same time, this summons serves as a demand for the rebels to prepare themselves in purity [אור החיים] and offers them one last opportunity to change their minds and repent before God [הכתב והקבלה].

The summons involves a shift in the participants, reflecting the unfolding drama. Initially, Moses intended the test for all the rebels. However, after Dathan and Abiram defiantly refuse to appear, Moses excludes them, restricting the test solely to the two hundred and fifty men carrying the fire pans [רמב״ן, הטור הארוך, ביאור יש״ר, גור אריה, מלבי״ם, מזרחי, הכתב והקבלה]. The inclusion of Aaron in the trial is also a crucial adjustment. The primary approach among commentators is that Moses did not originally include his brother. Korah feared that if Aaron was absent and no divine fire descended, the people would simply assume God was ignoring the rebels because He had already chosen Aaron during the Tabernacle's dedication. By adding Aaron to the test, Moses levels the playing field, which finally convinces Korah to agree [רמב״ן, הטור הארוך].

Other commentators view the changing roster as evidence of a heated, real time dialogue. When Moses first addresses the entire assembly, Korah interrupts, arguing that his dispute is solely with Aaron and not with Moses. Moses immediately agrees, removing himself from the trial to prove he has no personal desire for the priesthood, and formally sets the participants as Korah, his men, and Aaron [ריב״א, פענח רזא, שפתי חכמים, אלשיך]. Moses deliberately mentions the rebels before Aaron to demonstrate strict impartiality, ensuring his brother receives no preferential treatment [ביאור יש״ר, אלשיך]. Yet, Aaron is intentionally listed at the very end to indicate that, unlike the rebels, he requires no preparation or repentance, as he already stands in complete holiness [אור החיים, הכתב והקבלה]. This sentence structure also carries a tragic foreshadowing: Korah and his followers are grouped together for destruction, while Aaron stands entirely apart, destined for life [פענח רזא].

Setting the trial for the following day establishes a precise time for judgment, a necessary component of proper legal procedure [תורה תמימה]. Moses chooses an immediate timeframe to prevent the rebels from stalling and gathering more supporters [אור החיים]. Furthermore, scheduling a specific moment guarantees that everyone will offer their incense simultaneously. If the offerings were made at different times, the rebels could later argue that Aaron only survived because God does not perform miracles at every given moment. A simultaneous test ensures that the divine verdict is absolute and undeniable [גור אריה].