Exodus 28:33

31“You shall make the robe of the ephod all of blue.

32It shall have a hole for the head in the middle of it. It shall have a binding of woven work around its hole, as it were the hole of a coat of mail, that it not be torn.

33On its hem you shall make pomegranates of blue, and of purple, and of scarlet, all around its hem; with bells of gold between and around them:

34a golden bell and a pomegranate, a golden bell and a pomegranate, around the hem of the robe.

35It shall be on Aaron to minister: and its sound shall be heard when he goes in to the holy place before the LORD, and when he comes out, that he not die.