Musannaf Ibn Abi Shayba 18:383

Abu Bakr narrated to us, he said: Yazid bin Harun narrated to us, from Sa’id bin Abi ‘Aruba, from Qatada, from Ibn Burayda, from Yahya bin Ya’mar, from Ibn ‘Abbas, from ‘Umar bin al-Khattab, he said regarding the paralyzed hand: If it is cut off, [the compensation is] one-third of the blood money.