The savior angel had urged Lot himself to take refuge with Abraham. But he refused, and said: "As long as I dwelt apart from Abraham, God compared my deeds with the deeds of my fellow-citizens, and among them I appeared as a righteous man. If I should return to Abraham, God will see that his good deeds outweigh mine by far." The angel then granted his plea that Zoar be left undestroyed. This city had been founded a year later than the other four; it was only fifty-one years old, and therefore the measure of its sins was not so full as the measure of the sins of the neighboring cities.
Destruction of Sodom of Zoar
Legends of the Jews 5:175