Musannaf Ibn Abi Shayba 18:190

Abu Bakr narrated to us, he said: Abd al-Rahim ibn Sulayman narrated to us, from Muhammad ibn Ishaq, who said: Regarding the two lips, there is the full blood money (diyah). In the lower one, there is two-thirds of the blood money, and in the upper one, there is one-third of the blood money.