Exodus 28:31-35

“You shall make the robe of the ephod all of blue. There shall be an opening at its top in the middle of it; around 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. 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: a golden bell and a pomegranate, a golden bell and a pomegranate, all around on the hem of the robe. It shall be on Aaron when he ministers; and its tinkling shall be heard when he enters and leaves the holy place before the LORD, so that he will not die.