And thou shalt put in the breastplate of judgment the {n} Urim and the Thummim; and they shall be upon Aaron's heart, when he goeth in before the LORD: and Aaron shall bear the judgment of the children of Israel upon his heart before the LORD continually.

(n) Urim signifies light, and thummim perfection: declaring that the stones of the breastplate were most clear, and of perfect beauty: by urim also is meant knowledge, and thummim holiness, showing what virtues are required in the priests.

Scofield Reference Notes

[1] Urim and Thummim

Urim and Thummim, meaning "lights and perfections." Some make these to be simply a collective name for the stones of the breastplate, so that the total effect of the twelve stones is to manifest the "lights and perfections" of Him who is the antitype of the Aaronic high priest. Per contra, Lev 8:8. This would seem to be conclusive that "the Urim and Thummim" are additional to the stones of the breastplate. In use the Urim and Thummim were connected, in some way not clearly expressed, with the ascertainment of the divine will in particular cases Num 27:21 Dt 33:8 1Sam 28:6 Ezra 2:63.Exodus 28:30 Parallel Commentaries

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