Mosiah 3:27 · Jacob 6:10
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Sixteen-word verbatim run: 'lake of fire and brimstone, whose flames are unquenchable, and whose smoke ascendeth up forever and ever' - only these two verses carry it (verified by search of the corpus). Extends the registered chain jac-atone-lake (Jacob 6:10 <-> 2 Nephi 9:26) and 2ne-atone-monster. Alternate considered and disclosed: 2 Nephi 9:16 shares 3:27's opening 'their torment is as a lake of fire and brimstone' but continues 'whose flame ascendeth up forever and ever and has no end' (no 'unquenchable'/'smoke'); Jacob 6:10 carries the longer exact run and was chosen. Benjamin's own 2:38 ('like an unquenchable fire, whose flame ascendeth up forever and ever') sits verbally between, inside the same discourse.