Exodus 28:16

“Four square it shall be, [being] doubled, etc.] That is, when it was doubled; for the length of it, according to Maimonides f821, was a cubit, which is two spans, and so, when it was doubled, was but one, and its length and breadth being alike, as follows: a span [shall be] the length thereof, and a span [shall be] the breadth thereof; a square, which is the measure, the form of the new Jerusalem, the church of Christ, (<662116>Revelation 21:16) and may denote the perfection, firmness, and immovableness of it, (<19C501>Psalm 125:1). Some have thought that this breastplate was doubled, in order to have something enclosed in it: some imagine, that within this fold were put the Urim and…”

“(Compare Exodus 39:1-31.) Moses is now commanded to commit all that pertains to the offerings made to the Lord in the sanctuary to the exclusive charge of the members of a single family, who were to hold their office from generation to generation. In the patriarchal times, the external rites of worship had generally been conducted by the head of the tribe or family, in accordance with the principle involved in the dedication of the firstborn Exodus 13:2; Numbers 3:12-13. Moses, as the divinely-appointed and acknowledged leader of the nation, had, on a special occasion, appointed those who were to offer sacrifice, and had himself sprinkled the consecrating blood of the victims on the people…”