Exodus 28:31-35
31“aYou shall make the robe of the ephod entirely of 1blue. 32“There shall be an opening 1at its top in the middle of it; around the edge of its opening there shall be a binding of woven work, like the opening of a coat of mail, so that it will not be torn. 33“You shall make on its hem pomegranates of blue and purple and scarlet material, all around on its hem, and bells of gold between them all around: 34a golden bell and a pomegranate, a golden bell and a pomegranate, all around on the hem of the robe. 35“It shall be on Aaron 1when he ministers; and its sound shall be heard when he comes into the holy place before Yahweh and when he goes out, so that he will not die.