Exodus 28:30

Overview - Exodus 28
Aaron and his sons are set apart for the priest's office.
Holy garments are appointed.
The ephod and girdle.
15 The breast-plate with twelve precious stones.
30 The Urim and Thummim.
31 The robe of the ephod, with pomegranates and bells.
36 The plate of the mitre.
39 The embroidered coat.
40 The garments for Aaron's sons.
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Exodus 28:30  (King James Version)
And thou shalt put in the breastplate of judgment the 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.

the Urim and Thummim
[\^Mymth taw Myrwa ta\^] the Urim and Thummim, lights and perfections; rendered by the LXX. [\~dhlwsiv kai alhyeia\~,] manifestation and truth; and, by the Vulgate, {doctrina et veritas,} doctrine and truth. Among the various and contradictory opinions respecting the form and substance of these mysterious appendages, the most probable seems to be that of Josephus, Philo, Bp. Patrick, Parkhurst, and the Jewish writers generally; who state, that they were no other than the twelve precious stones of the high priest's breastplate
In support of this statement, it is observed, 1. That in the description of the high priest's breastplate, Exod
39:8 et seq., the Urim and Thummim are not mentioned, but only the rows of stones; and on the contrary, in Lev. 8:8 the Urim and Thummim are expressly mentioned, but not a
word is said of the four rows of stones 2. As Moses has given such a particular description of every thing relative to the high priest's dress, these would certainly have been described had they been different from what was previously mentioned.
Leviticus 8:8 ; Numbers 27:21 ; Deuteronomy 33:8 ; Judges 1:1 ; Judges 20:18 Judges 20:23 Judges 20:27 Judges 20:28 1 Samuel 23:9-12
1 Samuel 28:6 ; 1 Samuel 30:7 1 Samuel 30:8 Ezra 2:63 ; Nehemiah 7:65

bear the judgment
Zechariah 6:13

upon his heart
2 Corinthians 6:11 2 Corinthians 6:12 ; 7:3 12:15 Philippians 1:7 Philippians 1:8 ; Hebrews 2:17 ; 4:15 Hebrews 9:12 Hebrews 9:24