Leviticus 8:8

He then set the breastpiece ¹  on him and put the Urim and Thummim ²  into the breastpiece.

Ex 28:15-29; Ex 28:30; Ex 39:8-21; Ezr 2:63; So 8:6; Isa 59:17; Eph 6:14; 1Th 5:8

¹ sn The breastpiece was made of the same material as the ephod and was attached to it by means of gold rings and chains on its four corners (Exod 28:15-30; 29:5; 39:8-21). It had twelve stones attached to it (representing the twelve tribes of Israel), and a pocket in which the Urim and Thummim were kept (see following).

² sn The Urim and Thummim were two small objects used in the casting of lots to discern the will of God (see Exod 28:30; Num 27:21; Deut 33:8; 1 Sam 14:41 in the LXX and 28:6; Ezra 2:63 and Neh 7:65). It appears that by casting them one could obtain a yes or no answer, or no answer at all (1 Sam 28:6; J. E. Hartley, Leviticus [WBC], 111-12). See the extensive discussion in J. Milgrom, Leviticus (AB), 1:507-11.