Isaiah 13:3 (King James Bible) I have commanded my sanctified ones I have also called my mighty ones
While taking down Joseph Smith’s dictation here in 2 Nephi 23:3, Oliver Cowdery initially wrote the singular “my sanctified one”. Almost immediately he corrected the one to ones, the King James reading (there is no change in the level of ink flow). Notice in particular the agreement in number with the following “my mighty ones”. For additional discussion regarding the tendency to omit the plural s ending, see under 2 Nephi 7:6.
Summary: Maintain both instances of the plural ones in 2 Nephi 23:3 (“my sanctified ones … my mighty ones”), which is the King James reading.