Exodus 39:19-21

New International Version

¹⁹ They made two gold rings and attached them to the other two corners of the breastpiece on the inside edge next to the ephod. ²⁰ Then they made two more gold rings and attached them to the bottom of the shoulder pieces on the front of the ephod, close to the seam just above the waistband of the ephod. ²¹ They tied the rings of the breastpiece to the rings of the ephod with blue cord, connecting it to the waistband so that the breastpiece would not swing out from the ephod—as the Lord commanded Moses.