Musnad Abi Ya'la 169 — Kulayb (may Allah have mercy on him) relates

Kulayb (may Allah have mercy on him) relates concerning Sayyiduna Umar (may Allah be pleased with him): I met Sayyiduna Umar (may Allah be pleased with him) during the days of Hajj, and I called out to him from behind the tent, saying that I am so-and-so son of so-and-so al-Jarmi, and that the brother of a nephew of ours (a sister's son) is a captive with Banu so-and-so. We offered them the obligation fixed by the Messenger of Allah (peace and blessings be upon him) (blood-money or ransom), but they refused to accept it. The narrator says: Then Sayyiduna Umar (may Allah be pleased with him) lifted one side of the tent and asked: "Do you recognise this man of yours?" I said: Yes, this is the man. Then he (may Allah be pleased with him) said: "We will take him along so that he may carry out the judgement of the Messenger of Allah (peace and blessings be upon him) for the two of you." The narrator says: We used to talk about how that (Prophetic) judgement consisted of four camels.