Exodus 28:16

זרת ארכו וזרת רחבו A SPAN IN LENGTH AND A SPAN IN WIDTH, being double (Exodus 39:9) and it lay on him in front over his heart, as it is said, (v. 30) “And they shall be upon Aaron’s heart.” It was suspended from the shoulder-pieces of the ephod which came from behind him upon his shoulders and hung over and fell down a little way in front of him, and the breast-plate was suspended from them by means of the chains and rings, as is explained in the section (vv. 22—29).

Foursquare it shall be, being doubled; a span shall be its length, and a span shall be the breadth of it.

רָב֥וּעַ יִֽהְיֶ֖ה כָּפ֑וּל זֶ֥רֶת אׇרְכּ֖וֹ וְזֶ֥רֶת רׇחְבּֽוֹ׃