And in the breastpiece of judgment you shall put the Urim and the Thummim, and they shall be on Aaron’s heart, when he goes in before the LORD. Thus Aaron shall bear the judgment of the people of Israel on his heart before the LORD regularly.
30. And thou shalt put in the breastplate. From these words some infer that the Urim and Thummim were distinct from the whole work, which is before described; others think that they were the twelve stones, because no mention will be made of them when Moses relates that the whole was completed.
The most considerable of the ornaments of the high priest was this breast-plate, a rich piece of cloth, curiously wrought with gold and purple, etc., two spans long and a span broad, so that, being doubled, it was a span square, Exo 28:16.
Commenting on Exodus 28:15-30
And thou shall make the robe of the ephod all of blue. This was a different garment from the ephod, was longer than that, and was under it, and of different materials: that was made of gold, blue, purple, scarlet, and fine linen; this only of linen, and wholly of a blue colour, without any curious figures upon it, as were on that: in Exo...