WC records JS teaching about celestial U&T.
"Instruction, 2 April 1843, as Reported by William Clayton," 69, The Joseph Smith Papers, accessed August 22, 2021
Then the white stone mentioned in Rev. c 2 v 17 is the Urim & Thummim whereby all things pertaining to an higher order of kingdoms even all kingdoms will be made known and a the white stone is given to each of those who come into this the celestial kingdom...
Later canonized in D&C 130.