Littérature du Second Temple sur L’Exode 28:17

[81] That he is referring to these patriarchs he shows elsewhere when he says of the high-priestly garment, “And thou shalt weave together in it precious stones in fourfold order: there shall be a row of precious stones, sardius, topaz, smaragdus, making the one row”—Reuben, Simeon, Levi—“and the second row” it says “ruby and sapphire” (Exod. 28:17 f.): but the sapphire is a green stone. Now Judah is engraved in the ruby, for he is fourth in order, and Issachar on the sapphire.

[185] And Moses celebrates this number in several places, telling us of twelve tribes in the nation, directing twelve loaves to be set forth on the Table, bidding them weave twelve inscribed stones on the “oracle” in the holy vestment of the high priest’s full-length robe (Ex. 28:17 ff.).