The climax of the assassination attempt against the king concludes with a rigorous investigation, public punishment, and careful documentation. Upon receiving the warning, the king initiates a thorough inquiry that confirms the involvement of the two guards [אבן עזרא מהדורא תניינא, עמנואל הרומי, ביאור שטיינזלץ]. Commentators offer various perspectives on exactly what the investigation uncovered. Some suggest that the physical poison was found directly in the king's water cup [יוסף אבן יחיא] or located in a secret hiding spot [מלבי״ם]. Others describe a miraculous intervention: although the assassins tried to dispose of the evidence, the poison was inexplicably discovered. One tradition even suggests that God placed a snake inside the water pitcher to definitively prove their guilt [נחל אשכול, מנות הלוי]. A different approach focuses on circumstantial evidence. The guards had plotted in their native language, assuming Mordecai would not understand them, unaware of his extensive linguistic expertise gained from sitting in the high court. To carry out the poisoning, both guards had to abandon their separate posts simultaneously. The investigation simply uncovered their highly suspicious, coordinated absence, which alone proved the conspiracy [תורה תמימה].
Following the discovery, both conspirators are executed by hanging. This was the standard Persian penalty for treason, intended to publicly disgrace those who rebelled against the crown [יוסף אבן יחיא, ביאור שטיינזלץ]. While some commentators maintain that each guard was hanged on a separate tree [אבן עזרא, עמנואל הרומי], others suggest they were executed together on a single, multi-beamed structure [מנות הלוי]. Beyond the physical punishment, the specific method of execution carries profound symbolic weight. It acts as the cure prepared before the disease, foreshadowing that just as these high-ranking officials met their end on a tree, so too will the future enemy, Haman, face the exact same fate [אור חדש].
Mordecai’s life-saving intervention is subsequently documented in the official royal chronicles, which were kept readily available for the king [רש"י, יוסף אבן יחיא, ביאור שטיינזלץ]. This recording was deliberately conducted in the direct presence of the king. Esther and the monarch deeply distrusted the royal scribes, who were known enemies of Mordecai—with some traditions identifying the scribe as Haman's own son. They feared that if left unsupervised, the scribes would intentionally omit Mordecai’s name or forge the details to deny him honor. By demanding the event be recorded before his own eyes, the king ensured the facts were preserved so he could eventually reward Mordecai [עמנואל הרומי, אור חדש, מנות הלוי]. Furthermore, the account was entered into the king’s personal memory book rather than the general archives managed by the viceroy, a strategic move that prevented Haman from erasing the record later on [מלבי״ם].
Beneath these seemingly bureaucratic procedures lies a profound layer of Divine providence. The fact that Mordecai is not immediately rewarded is entirely intentional; his merit is carefully held in reserve for a future day when the entire nation will desperately require a mechanism of salvation [מלבי״ם]. On a deeper spiritual level, commentators note that the earthly king mirrors God. If a mortal ruler's ledger ensures that a person's loyalty is not forgotten, God's heavenly ledger certainly preserves every righteous act. Mordecai's integrity in reporting the plot accurately was inscribed in Heaven, securing a merit that would eventually bring redemption to the world [תורה תמימה, חומת אנך].