Exodus 28:31

27 Make two additional gold rings and attach them to the bottom of the two shoulder pieces of the ephod, on its front, near its seam just above its woven waistband.

28 The rings of the breastpiece shall be tied to the rings of the ephod with a cord of blue yarn, so that the breastpiece is above the waistband of the ephod and does not swing out from the ephod.

29 Whenever Aaron enters the Holy Place, he shall bear the names of the sons of Israel over his heart on the breastpiece of judgment, as a continual reminder before the LORD.

30 And place the Urim and Thummim in the breastpiece of judgment, so that they will also be over Aaron’s heart whenever he comes before the LORD. Aaron will continually carry the judgment of the sons of Israel over his heart before the LORD.

31 You are to make the robe of the ephod entirely of blue cloth,

32 with an opening at its top in the center. Around the opening shall be a woven collar with an opening like that of a garment, so that it will not tear.

33 Make pomegranates of blue, purple, and scarlet yarn all the way around the lower hem, with gold bells between them,

34 alternating the gold bells and pomegranates around the lower hem of the robe.

35 Aaron must wear the robe whenever he ministers, and its sound will be heard when he enters or exits the sanctuary before the LORD, so that he will not die.

Read all of Exodus 28