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This is the first place in the Bible the Urim and Thummim are mentioned. Why in the Pearl of Great Price is Abraham claiming he had possession of them long before God had commanded Aaron to use them in the Holy of the Holies? Abraham died circa BC 1816. Aaron wasn’t even born until BC 1529, some 287 years after Abraham died. I would ask the Mormon why there’s such a huge discrepancy in this important historical event.
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Abraham 3:1; “And I, Abraham, had the Urim and Thummim, which the Lord my God had given unto me, in Ur of the Chaldees.”