Exodus 39:21-23

New International Version - UK

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.

Other priestly garments

²² They made the robe of the ephod entirely of blue cloth – the work of a weaver – ²³ with an opening in the centre of the robe like the opening of a collar,^[a] and a band around this opening, so that it would not tear.