Commentary Inf XIV 28-29

The flakes of fire showering down on all those who were violent against God seem most directly derived from the brimstone and fire rained down upon the inhabitants of Sodom and Gomorrah for their allowance of the practice of homosexuality ('And it was thus that the Lord rained down upon Sodom and Gomorrha brimstone and fire' -- Gen. 19:24), as was perhaps first observed by Vellutello (DDP Vellutello.Inf.XIV.28-30).