the Urim and Thummim: Rabbi Johanan said that the letters of the stones in the breastplate stood out to spell out the answer. Resh Lakish said that the letters joined each other to spell words. But the Gemara noted that the Hebrew letter , tsade, was missing from the list of the 12 tribes of Israel. Rabbi Samuel bar Isaac said that the stones of the breastplate also contained the names of Abraham, Isaac and Jacob. But the Gemara noted that the Hebrew letter , teth, was also missing. Rav Aha bar Jacob said that they also contained the words: "The tribes of Jeshurun." The Gemara taught that although the decree of a prophet could be revoked, the decree of the Urim and Thummim could not be revoked, as says, "By the judgment of the Urim." The Pirke De-Rabbi Eliezer taught that when Israel sinned in the matter of the devoted things, as reported in Joshua looked at the 12 stones corresponding to the 12 tribes that were upon the High Priest's breastplate. For every tribe that had sinned, the light of its stone became dim, and Joshua saw that the light of the stone for the tribe of Judah had become dim. So Joshua knew that the tribe of Judah had transgressed in the matter of the devoted things. Similarly, the Pirke De-Rabbi Eliezer taught that Saul saw the Philistines turning against Israel, and he knew that Israel had sinned in the matter of the ban. Saul looked at the 12 stones, and for each tribe that had followed the law, its stone (on the High Priest's breastplate) shined with its light, and for each tribe that had transgressed, the light of its stone was dim. So Saul knew that the tribe of Benjamin had trespassed in the matter of the ban. The Mishnah reported that with the death of the former prophets, the Urim and Thummim ceased. In this connection, the Gemara reported differing views of who the former prophets were. Rav Huna said they were David, Samuel, and Solomon. Rav Nachman said that during the days of David, they were sometimes successful and sometimes not (getting an answer from the Urim and Thummim), for Zadok consulted it and succeeded, while Abiathar consulted it and was not successful, as reports, "And Abiathar went up." (He retired from the priesthood because the Urim and Thummim gave him no reply.)