The first time that the Bible mentions “Urim and Thummim” is in Exodus 28:30, in connection with the garments for the high priest; especially, the “ephod” and the “breastplate of judgment.” The breastplate was to be placed on the ephod (Exodus 28:28), and verse 30 reads: “And you shall put in the breastplate of judgment the Urim and the Thummim, and they shall be over Aaron’s heart when he goes in before the LORD.” A similar statement can be found in Leviticus 8:8.
In Numbers 27:21, only the Urim is mentioned [but it has been understood that it included the Thummim as well–“Urim” is used here as a summary term for both]. On this occasion, God asked Moses to transfer some of his authority to Joshua. Verse 21 reads: “He [Joshua] shall stand before Eleazar the priest, who shall inquire before the LORD for him by the judgment of the Urim–at his word they shall go out, and at his word they shall come in…”
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