Exodus 28:31-35

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

32It shall have an opening for the head in the middle of it, with a woven binding around the opening, like the opening in a garment, so that it may not tear.

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.