Musannaf Ibn Abi Shaybah 29812 — Two men who wound a man's head: one

Ash'ath said: Two men together wounded a man on the head. One of them wounded him down to the membrane of the brain, and the other wounded him down to the bone of the head. It was not known, nor did either of them know, which one had wounded down to the membrane of the brain and which one had wounded down to the bone of the head. Concerning this, al-Hasan al-Basri said: Upon each of them is half the blood money for the wound reaching the membrane of the brain and half the blood money for the wound reaching the bone of the head.