Musannaf Ibn Abi Shaybah

Hazrat Abu Ma'shar narrates that Ibrahim said: A man intentionally killed another person, so some of the heirs of the murdered person forgave the killer. Then this matter was presented before Hazrat Umar. He said to Hazrat Abdullah bin Mas'ud, "What do you say about this?" Hazrat Abdullah replied: "O Commander of the Faithful! Actually, you are more entitled to speak about this." Then Hazrat Abdullah said: "When some of the heirs have forgiven the killer, then qisas (retaliation) will not be carried out, and the share of those who forgave will be forfeited. The remaining heirs will receive the remaining blood money." Upon this, Hazrat Umar said: "This is the correct opinion, and you have agreed with what was in my heart."