And these shall be the vestments that they shall make: A rational and an ephod, a tunick and a strait linen garment, a mitre and a girdle. They shall make the holy vestments for thy brother Aaron and his sons, that they may do the office of priesthood unto me.
And thou shalt make the rational of judgment with embroidered work of divers colours, according to the workmanship of the ephod, of gold, violet, and purple, and scarlet twice dyed, and fine twisted linen.
 "The rational of judgment": This part of the priest's attire, which he wore at his breast, was called the rational of judgment; partly because it admonished both priest and people of their duty to God, by carrying the names of all their tribes in his presence; and by the Urim and the Thummim, that is, doctrine and truth, which were written upon it; and partly because it gave divine answers and oracles, as if it were rational and endowed with judgment.
And may be fastened by the rings thereof unto the rings of the ephod with a violet fillet, that the joining artificially wrought may continue, and the rational and the ephod may not be loosed one from the other.
And thou shalt put in the rational of judgment doctrine and truth, which shall be on Aaron's breast, when he shall go in before the Lord: and he shall bear the judgment of the children of Israel on his breast, in the sight of the Lord always.
 "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.
Hanging over the forehead of the high priest. And Aaron shall bear the iniquities of those things, which the children of Israel have offered and sanctified, in all their gifts and offerings. And the plate shall be always on his forehead, that the Lord may be well pleased with them.
And with all these things thou shalt vest Aaron thy brother, and his sons with him. And thou shalt consecrate the hands of them all, and shalt sanctify them, that they may do the office of priesthood unto me.
And Aaron and his sons shall use them when they shall go in to the tabernacle of the testimony, or when they approach the altar to minister in the sanctuary, lest being guilty of iniquity they die. It shall be a law for ever to Aaron, and to his seed after him.