Targum zu Bereschit 19:24

And the Word of the Lord had caused showers of favour to descend upon Sedom and Amorah, to the intent that they might work repentance, but they did it not: so that they said, Wickedness is not manifest before the Lord. Behold, then, there are now sent down upon them sulphur and fire from before the Word of the Lord from Heaven.

And the Word of the Lord Himself had made to descend upon the people of Sedom and Amorah showers of favour, that they might work repentance from their wicked works. But when they saw the showers of favour, they said, So, our wicked works are not manifest before Him. He turned (then), and caused to descend upon them bitumen and fire from before the Lord from the heavens.