Musannaf Ibn Abi Shaybah 29633 — Reports on the qasamah

Al-Qasim bin Abd al-Rahman said: Two men from Kufah set out for Sayyiduna Umar bin al-Khattab (may Allah be pleased with him). They found that he had left the House (of Allah) and was heading for Mina. They circumambulated the House, then caught up with him and told him their story. They said: "O Commander of the Believers, a cousin of ours has been killed, and we all have an equal claim in his blood." He remained silent, giving them no reply at all, until they adjured him by Allah. Then he charged at them. Then they reminded him of Allah, and he held back from them. Then Umar said: "Woe to us if we are not reminded of Allah, and woe to us if we do not remember Allah. Are there among you two upright witnesses whom you can bring against the one who killed him, so that we may grant you retaliation against him? Otherwise, those who ward off your claim shall swear by Allah: We did not kill and we do not know a killer. If they refuse, fifty of you shall swear, and then the blood money will be yours."