Musannaf Ibn Abi Shayba 18:1091

Abu Bakr narrated to us, he said: Abd al-A’la narrated to us, from Ma’mar, from al-Zuhri, that he was asked about a slain person found in a man’s house. The master of the house said, "He came to me at night to steal from me, so I killed him." The family of the slain person said, "He invited him to his house and killed him." He said: "If fifty [men] from the family of the slain person swear that he invited him and killed him, then he is to be executed for him. And if they refuse, they must pay the blood money." Al-Zuhri said: "Ibn ‘Affan judged regarding a slain person from Banu Qurrah whose guardians refused to swear, so Uthman made him pay the blood money."