Malachi 3:2 (King James Bible) for he is like a refiner’s fire and like fullers’ soap
The printer’s manuscript has no apostrophes for refiner’s or fullers’/fuller’s. The 1830 typesetter added the apostrophes, but in accord with the spellings in the King James Bible; that is, as refiner’s and fullers’. For the 1837 edition, fullers’ was changed to fuller’s. This spelling has been retained in both the LDS and RLDS texts, even though the King James Bible has the spelling fullers’.
In the original 1611 King James Bible, there were no apostrophes; the text in Malachi 3:2 was set as “for he is like a refiners fire, and like fullers sope.” When the apostrophes were added, the apostrophe for fullers was placed after the s, which is in accord with the original Hebrew where the word for fuller is in the plural (refiner is in the singular). The critical text will therefore restore here in 3 Nephi 24:2 the original plural possessive fullers’ (and retain the original singular possessive refiner’s ).
Summary: In 3 Nephi 24:2 the Book of Mormon spelling fuller’s soap is incorrect and should be altered to fullers’ soap, in accord with the King James reading as well as the original Hebrew; the singular refiner’s is correct and will be maintained.