Adam Clarke on Genesis 19:27

Abraham gat up early in the morning - Anxious to know what was the effect of the prayers which he had offered to God the preceding day; what must have been his astonishment when he found that all these cities, with the plain which resembled the garden of the Lord, Gen 13:10, burnt up, and the smoke ascending like the smoke of a furnace, and was thereby assured that even God himself could not discover ten righteous persons in four whole cities!