“It is written: And you shall place in the breastplate of judgment the Urim and Thummim (Exodus 28:30), and this has been established: The Urim—that shine, mystery of the speculum that shines, and this is engraving of the letters of the Holy Name, in mystery of forty-two, by which worlds were created, and they were embedded in it. And the Thummim—mystery of those letters contained in the place of the speculum that does not shine, which is conducted by seventy-two engraved letters, mystery of the Holy Name. All of them are called Urim and Thummim” (Zohar 2:234b).
And Saul inquired of God, “Shall I go down after the Philistines? Will you give them in the hand of Israel?” And He did not answer him on that day… And Saul said, “YHWH, God of Israel! Why did You not answer Your servant today? If there is guilt in me or in Jonathan my son, O YHWH God of Israel, show Urim, and if it is Your people Israel, show Thummim” (1 Samuel 14:37).