It's in Book One Chapter 11 of the Antiquities of the Jews -- 4. But God was much displeased at their impudent behavior, so that he both smote those men with blindness, and condemned the Sodomites to universal destruction. But Lot, upon God's informing him of the future destruction of the Sodomites, went away, taking with him his wife and daughters, who were two, and still virgins; for those that were betrothed to them were above the thoughts of going, and deemed that Lot's words were trifling. God then cast a thunderbolt upon the city, and set it on fire, with its inhabitants; and laid waste the country with the like burning, as I formerly said when I wrote the Jewish War. But Lot's wife continually turning back to view the city as she went from it, and being too nicely inquisitive what would become of it, although God had forbidden her so to do, was changed into a pillar of salt;for I have seen it, and it remains at this day. Now he and his daughters fled to a certain small place, encompassed with the fire, and settled in it: it is to this day called Zoar, for that is the word which the Hebrews use for a small thing. There it was that he lived a miserable life, on account of his having no company, and his want of provisions.
