Keluaran 28:12

28:12 You are to put the two stones on the shoulders of the ephod, stones of memorial for the sons of Israel, and Aaron will bear their names before the Lord on his two shoulders for a memorial. ¹ 

Keluaran 28:29-30

28:29 Aaron will bear the names of the sons of Israel in the breastpiece of decision over his heart ²  when he goes into the holy place, for a memorial before the Lord continually.

28:30 “You are to put the Urim and the Thummim ³  into the breastpiece of decision; and they are to be over Aaron’s heart when he goes in before the Lord. Aaron is to bear the decisions ⁴  of the Israelites over his heart before the Lord continually.

[28:12]  ¹ sn This was to be a perpetual reminder that the priest ministers on behalf of the twelve tribes of Israel. Their names would always be borne by the priests.

[28:29]  ² sn So Aaron will have the names of the tribes on his shoulders (v. 12) which bear the weight and symbol of office (see Isa 9:6; 22:22), and over his heart (implying that they have a constant place in his thoughts [Deut 6:6]). Thus he was to enter the presence of God as the nation’s representative, ever mindful of the nation’s interests, and ever bringing the remembrance of it before God (S. R. Driver, Exodus, 306).

[28:30]  ³ sn The Urim and the Thummim were two objects intended for determining the divine will. There is no clear evidence of their size or shape or the material of which they were made, but they seem to have been familiar items to Moses and the people. The best example of their use comes from 1 Sam 14:36-42. Some have suggested from the etymologies that they were light and dark objects respectively, perhaps stones or sticks or some other object. They seem to have fallen out of use after the Davidic period when the prophetic oracles became popular. It may be that the title “breastpiece of judgment” indicates that these objects were used for making “decisions” (J. P. Hyatt, Exodus [NCBC], 283-84). U. Cassuto has the most thorough treatment of the subject (Exodus, 378-82); he lists several very clear rules for their uses gathered from their instances in the Bible, including that they were a form of sacred lot, that priests or leaders of the people only could use them, and that they were used for discovering the divine will in areas that were beyond human knowledge.

[28:30]  ⁴ tn Or “judgment” (KJV, ASV, NASB, NRSV). The term is מִשְׁפָּט (mishpat), the same word that describes the breastpiece that held the two objects. Here it is translated “decisions” since the Urim and Thummim contained in the breastpiece represented the means by which the Lord made decisions for the Israelites. The high priest bore the responsibility of discerning the divine will on matters of national importance.