13 And Shaul said to him, “Why have you and the son of Yishai conspired against me? You gave him food and a sword, and inquired of Hashem for him—that he may rise in ambush against me, as is now the case.”
22:13 And inquired of Hashem for him
The Urim Ve’Tumim, mystical objects in the Kohen Gadol’s breastplate, were used to receive communication from Hashem. Divine messages were transmitted through the illumination of the twelve stones on the breastplate, which represented the twelve tribes of Israel. Rashi explains that by using the Urim Ve’Tumim to ask Hashem to provide instruction to David , the Kohanim treated David as a king, since they are not allowed to inquire of the Urim Ve’Tumim for a regular citizen. Thus, King Shaul was angry not only that Achimelech had assisted David, but that he related to him as the king. The use of the Urim Ve’Tumim is another example of the high level of God’s direct involvement in the lives of the Children of Israel, felt most acutely in Eretz Yisrael.