John Gills Exposition of the Bible Commentary - Exodus 28:16
Four square it shall be, being doubled ,.... That is, when it was doubled; for the length of it, according to Maimonides F3 Cele Hamikdash, c. 9. sect. 6. , 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, Revelation 21:16 and may denote... read more
Matthew Henry's Complete Commentary - Exodus 28:15-30
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, Exod. 28:16. This was fastened to the ephod with wreathen chains of gold (Exod. 28:13, 14, 22) both at top and bottom, so that the breast-plate might not be loosed from the ephod, Exod. 28:28. The ephod was the garment of service; the breast-plate of judgment was an... read more