The true character of Urim (as expressing " aye ") and Thummim (as expressing " nay ") is shown by the reconstructed text of 1 Sam.
30 (Urim and Thummim), xxix.
URIM AND THUMMIM in the Bible.
If this fault be in me or in Jonathan my son, give Urim, and if it be in Thy people Israel, give Thummim.'
From this illuminating passage it is clear (a) that by means of the Urim and Thummim the guilt or innocence of the suspected parties was determined; (b) that this was effected by a series of categorical questions implying the simple alternative of "yes" or "no," or something positive or negative.