Musannaf Ibn Abi Shayba 18:1268

Abu Bakr narrated to us, he said: Al-Fadl ibn Dukayn and Yahya ibn Adam narrated to us, from Sufyan, from ‘Ata’ ibn al-Sa’ib, from Sa’id ibn Jubayr, from Ibn ‘Abbas: "Whoever gives it as charity, then it is an expiation for him." He said: "For the one who inflicted the wound."