Musannaf Ibn Abi Shayba 18:115

Abu Bakr narrated to us, he said: Muhammad ibn Bakr narrated to us, from Ibn Jurayj, he said: Abd al-Aziz ibn Umar informed me that in a book of Umar ibn Abd al-Aziz, from Umar ibn al-Khattab, he said: Regarding the ear, there is half of the blood money, or the equivalent of that in gold.