Musannaf Ibn Abi Shaybah 29589 — A man who deliberately kills a man

Ibrahim and al-Hasan al-Basri said, concerning a man who was killed deliberately, and the killer was imprisoned so that he could be killed in retaliation for the slain person; then a man came and killed that killer by mistake: His blood money is for the family of the prisoner. And Ata said: The family of the first slain person will receive his blood money.