In D&C 47, John Whitmer is appointed to keep "the church record and history continually."
Section 47:1-3, Doctrine and Covenants, The Church of Jesus Christ of Latter-day Saints, accessed July 22, 2024
1 Behold, it is expedient in me that my servant John should write and keep a regular history, and assist you, my servant Joseph, in transcribing all things which shall be given you, until he is called to further duties.
2 Again, verily I say unto you that he can also lift up his voice in meetings, whenever it shall be expedient.
3 And again, I say unto you that it shall be appointed unto him to keep the church record and history continually; for Oliver Cowdery I have appointed to another office.