Musannaf Ibn Abi Shayba 18:987

Abu Bakr narrated to us, he said: Waki’ narrated to us, he said: Zakariya narrated to us, from ‘Amir, that al-Hasan ibn ‘Ali was brought two men who had killed three people, and the two men had been wounded. Al-Hasan ibn ‘Ali said: "Upon the two men is the blood money for the three, and the wounds of the two men are lifted from them."