Midrasch zu Schemuel I 14:36

Know thou the power of the ban. Come and see from (the story of) Saul, the son of Kish, who decreed that all people, both young and old, should fast, as it is said, "Cursed be the man that eateth any food until it be evening" (1 Sam. 14:24). Jonathan did not hear (of this), and ate a little honey, and his eyes were enlightened, as it is said, "And his eyes were enlightened" (1 Sam. 14:27). Saul saw the Philistines returning against Israel, and he knew that Israel had trespassed in the matter of the ban. He looked at the twelve stones; for each tribe which performed one of the precepts had its stone || (on the High Priest's breast-plate) shining with its light, and each tribe which transgressed, the light of its stone was dim. He knew that the tribe of Benjamin had trespassed in the matter of the ban. He cast lots concerning Benjamin, and Saul and Jonathan were taken, as it is said, "And Jonathan and Saul were taken" (1 Sam. 14:41). Saul took his sword to slay his son, as it is said, "God do so, and more also: for thou shalt surely die, Jonathan" (1 Sam. 14:44). The people said to him: Our lord king ! It is an error. They brought on his behalf a sacrifice of a burnt offering for his error, and He was entreated of him, and they saved him from an evil death, as it is said, "So the people rescued Jonathan, that he died not" (1 Sam. 14:45).