Exodus 28:30

30Then you shall place in the breastplate of judgment, Doctrine and Truth, which shall then be upon Aaron’s chest, when he enters before the Lord. And he shall wear the judgment of the sons of Israel on his chest, in the sight of the Lord always.
28:30 Doctrine and Truth: Hebrew, Urim and Thummim: illuminations and perfections. These words, written on the rational, seem to signify the light of doctrine and the integrity of life, with which the priests of God ought to approach him.(Challoner)

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