Charles Buck Theological Dictionary
Urim and Thummim
(light and perfection, ) among the ancient Hebrews, a certain oracular manner of consulting God, which was done by the high priest, dressed in his robes, and having on his pectoral, or breast-plate. There have been a variety of opinions respecting the Urim and Thummim, and after all we cannot determine what they were. The use made of them was, to consult God in difficult cases relating to the whole state of Israel, and sometimes in cases relating to the king, the sanhedrim, the general of the army, or some other great personage.
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Buck, Charles. Entry for 'Urim and Thummim'. Charles Buck Theological Dictionary. https://www.studylight.org/dictionaries/eng/cbd/u/urim-and-thummim.html. 1802.