Al-Matalib al-'Aliyah 1908 — Blood money for accidental killing

It is narrated from Adi bin Thabit that in the time of the caliphate of Sayyiduna Mu'awiyah (may Allah be pleased with him), a man injured and smashed the mouth of another. The injured man was offered the blood-money (diyah), but he refused to take it. The people increased the amount until he was offered wealth equal to three blood-moneys. Meanwhile, one of the Companions of the Prophet (peace and blessings be upon him) narrated a hadith that the Messenger of Allah (peace and blessings be upon him) said: "Whoever gives away in charity, that is, forgives (for the pleasure of Allah), someone's blood or any wound less than that, this deed will become an expiation for all his past sins from the day of his birth to the day of that forgiveness." On hearing this virtue, the man forgave (his right).
Imam Abu Ya'la also recorded this report in the same way with his own chain, through Muhammad bin Abbad from Sufyan.