More than helpful commentary...

And a commandment I give unto thee—that thou shalt write for him; and the scriptures shall be given, even as they are in mine own bosom, to the salvation of mine own elect. Doctrine & Covenants 35:20

Sidney Rigdon was called by God to act as a scribe to the Prophet in what we know now as the Joseph Smith Translation of the Bible. Although others served as scribes in this great prophetic enterprise (Oliver Cowdery, Emma Smith, John Whitmer, and Frederick C. Williams), Sidney was the principal scribe; he was to the Joseph Smith Translation what Oliver Cowdery was to the Book of Mormon. The Lord said the scriptures would be given to the translators “even as they are in my own bosom” (D&C 35:20). That is, God would give through Joseph Smith scriptural insight that mirrored the thinking and feelings of the Almighty. Because we are commanded to live by every word that proceeds from the mouth of God (D&C 84:44), the inspired translation of the Bible serves as more than a helpful commentary, more than a useful historical device, more even than an alternative version of scripture. Receiving it in faith would lead to the salvation of souls. (Robert L. Millet and Lloyd D. Newell. Draw Near Unto Me: Daily Reflections on the Doctrine and Covenants. 95)