Exodus 28:33-35

33On its hem you shall make pomegranates of blue and purple and scarlet yarns, around its hem, with bells of gold between them, 34a golden bell and a pomegranate, a golden bell and a pomegranate, around the hem of the robe. 35And it shall be on Aaron when he ministers, and its sound shall be heard when he goes into the Holy Place before the  Lord, and when he comes out, so that he does not die.

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