Exodus 28:30-32

Complete Jewish Bible

³⁰ You are to put the urim and the tumim in the breastplate for judging; they will be over Aharon’s heart when he goes into the presence of Adonai. Thus Aharon will always have the means for making decisions for the people of Isra’el over his heart when he is in the presence of Adonai.

(iii) ³¹ “You are to make the robe for the ritual vest entirely of blue. ³² It is to have an opening for the head in the middle. Around the opening is to be a border woven like the neck of a coat of mail, so that it won’t tear.