Комментарий к Берешит 19:22

כי לא אוכל לעשות FOR I CANNOT DO [ANY THING]—This admission of their powerlessness was the angels’ punishment for having said, (v. 13) “For we will destroy the city”, attributing the act to themselves; therefore they could not go away from there (i. e., the incident could not close) until they were compelled to admit that the thing was not in their power) (Genesis Rabbah 50:9).

מהר..כי לא אוכל, because I have been commanded not to destroy the region until you have been saved.

From this you can learn that one destroys and the other rescues... But v. 17 does not prove this. Although it is written there, “He [the one angel] said, ‘Escape for your life,’” and it is not written, “They said,” it could be that only one angel rescued, but they both overturned.

כי לא אוכל FOR I CANNOT DO ANY THING — The pronoun is singular number. This proves that one was to overthrow the city and the other to deliver, for two angels are not sent on the same mission.

קרא, the city formerly known as בלע was renamed on account of what transpired on this occasion [We encountered the city and its king in Genesis 14,8. Ed.]

Based on: “It is insignificant.” Rashi is saying that this verse must refer back to והיא מצער, [as only that explains the name צוער]. This verse does not refer to what immediately precedes it.

על כן קרא שם העיר צוער THEREFORE THE NAME OF THE CITY WAS CALLED ZOAR, with reference to Lot’s words (v. 28) “And it is (מצער) a little one”.