And place the Urim and Thummim in the breastpiece of judgment, so that they will also be over Aaron’s heart whenever he comes before the LORD. Aaron will continually carry the judgment of the sons of Israel over his heart before the LORD.
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...