Shemot 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).

רָב֥וּעַ יִֽהְיֶ֖ה כָּפ֑וּל זֶ֥רֶת אׇרְכּ֖וֹ וְזֶ֥רֶת רׇחְבּֽוֹ׃

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