בראשית, פרק י״ט, פסוק כ״ב

In the tense, waiting moments just before the destruction of Sodom, a complex relationship is revealed between heavenly messengers and their mission. The annihilation of entire cities is paused, hanging entirely on the rescue of a single man, while the angels themselves are forced to expose the limits of their own power. The urgent command for Lot to escape stems from a strict schedule. The decree of destruction is set precisely for sunrise, and the heavenly messenger cannot delay the impending wrath. The rush ensures that Lot is saved through personal providence before the disaster actually begins. If he were to delay, saving him from within the upheaval itself would require an open miracle [העמק דבר].

The declaration by the angel that he is completely unable to act contains a deeper lesson. The primary approach among commentators is that this admission serves as an educational punishment. Earlier, the angels had boasted that they themselves were destroying the place. Even though they acknowledged that God sent them, simply taking credit for the destruction was viewed as a flaw. As a result, they were punished and held in place until they explicitly confessed that they possessed no independent power or authority to act without God's exact command [רש״י, גור אריה, משכיל לדוד, חתם סופר]. They were forced to admit their absolute submission to the task God assigned them [ביאור שטיינזלץ, בכור שור].

Furthermore, the angel speaks in the singular, which sheds light on how tasks are divided in the angelic realm. No two angels are ever dispatched to perform the same mission. One angel was appointed specifically to overturn Sodom, while the second was assigned solely to save Lot. The destroying angel simply could not begin his work until the saving angel had completed his task of bringing Lot to safety [רש״י, מזרחי, שפתי חכמים, דברי דוד].

Following this escape, the destination city receives a new identity. Originally known as Bela, an unidentified observer or people in general begin calling it Tzoar [רד״ק, ביאור יש״ר]. This new name stems from Lot's earlier plea, where he referred to it as a small place with few sins [רש״י, ביאור שטיינזלץ]. This change in name resolves a historical detail from an earlier battle involving the local kings, where the city is referred to as Bela, which is Tzoar. Commentators agree that the text used the city's future name in that earlier account so readers would recognize it as the exact same location. This explains both why Bela was spared from the destruction of Sodom and Gomorrah, and why the name Tzoar was absent from the earlier historical records [בכור שור, ברטנורא, ברכת אשר].