Book of Enoch (1 Enoch) 67:6
And when all this took place, from that fiery molten metal and from the convulsion thereof in that place, there was produced a smell of sulphur, and it was connected with those waters, and that valley of the angels who had led astray (mankind) burned beneath that land.
Background and history of Book of Enoch (1 Enoch), and issues with this book.
R. H. Charles, The Book of Enoch (London: SPCK, 1917), public domain. The verse text is the English Wikisource transcription of that translation. Charles’s editorial signs are kept. He rearranges some verses in chapters 5, 39, 90, 91, and 106, so those chapters are not a straight 1, 2, 3 sequence.