Exodus 28:31-35

31You are to make the robe of the ephod entirely of blue cloth, 32with an opening at its top in the center. Around the opening shall be a woven collar with an opening like that of a garment,1 so that it will not tear.

33Make pomegranates of blue, purple, and scarlet yarn all the way around the lower hem, with gold bells between them, 34alternating the gold bells and pomegranates around the lower hem of the robe.

35Aaron 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.