Heb. term that means Lights and Perfections. An instrument prepared of God to assist man in obtaining revelation from the Lord and in translating languages. See Ex. 28: 30; Lev. 8: 8; Num. 27: 21; Deut. 33: 8; 1 Sam. 28: 6; Ezra 2: 63; Neh. 7: 65; JS-H 1: 35.

Using a Urim and Thummim is the special prerogative of a seer, and it would seem reasonable that such instruments were used from the time of Adam. However, the earliest mention is in connection with the brother of Jared (Ether 3: 21-28). Abraham used a Urim and Thummim (Abr. 3: 1-4), as did Aaron and the priests of Israel, and also the prophets among the Nephites (Omni 1: 20-21; Mosiah 8: 13-19; Mosiah 21: 26-28; Mosiah 28: 11-20; Ether 4: 1-7). There is more than one Urim and Thummim, but we are informed that Joseph Smith had the one used by the brother of Jared (Ether 3: 22-28; D&C 10: 1; D&C 17: 1). (See Seer.) A partial description is given in JS-H 1: 35. Joseph Smith used it in translating the Book of Mormon and in obtaining other revelations.

This earth in its celestial condition will be a Urim and Thummim, and many within that kingdom will have an additional Urim and Thummim (D&C 130: 6-11).