Exodus 28:33-35

And upon the skirts of it thou shalt make pomegranates of blue, and of purple, and of scarlet, round about the skirts thereof; and bells of gold between them round about: a golden bell and a pomegranate, a golden bell and a pomegranate, upon the skirts of the robe round about. And it shall be upon Aaron to minister: and the sound thereof shall be heard when he goeth in unto the holy place before Jehovah, and when he cometh out, that he die not.