Musannaf Ibn Abi Shayba 18:348

Abu Bakr narrated to us, he said: Abu al-Ahwas narrated to us, from Abu Ishaq, from Asim ibn Damra, from Ali, who said: Regarding the *ja'ifah* (a wound that reaches the interior of the body), [the compensation is] one-third of the blood money (*diyah*).