Sayyidah Aishah (may Allah be pleased with her) said: When the Prophet (peace and blessings be upon him) passed away, Sayyiduna Abu Bakr (may Allah be pleased with him) was at al-Sunh. Sayyiduna Umar (may Allah be pleased with him) stood up and said: "By Allah! the Prophet (peace and blessings be upon him) has not died." Umar (may Allah be pleased with him) said: "By Allah, nothing came to my mind except that, and Allah, the Mighty and Majestic, will surely raise him up, and he will cut off the hands and feet of (certain) men." Then Sayyiduna Abu Bakr (may Allah be pleased with him) came, uncovered the Prophet (peace and blessings be upon him) and kissed him, and said: "May my father and mother be sacrificed for you! You were pure in life and in death. By Him in whose hand is my soul, Allah will never make you taste two deaths." Then he went out and said: "O you who are swearing, take it easy." When Sayyiduna Abu Bakr (may Allah be pleased with him) began to speak, Sayyiduna Umar (may Allah be pleased with him) sat down. He praised and glorified Allah, then said: "Whoever used to worship Muhammad (peace and blessings be upon him), then indeed Muhammad (peace and blessings be upon him) has died; and whoever worships Allah, then indeed Allah Almighty is Ever-Living and will never die." And he recited: "Indeed, you will die, and indeed, they will die." [Surah al-Zumar: 30] And he recited: "Muhammad is no more than a Messenger; messengers have passed away before him. So if he dies or is killed, will you turn back on your heels? And whoever turns back on his heels" [Surah Al Imran: 144] (the whole verse). The people began to weep, sobbing. Then the Ansar gathered around Sayyiduna Sa'd bin Ubadah (may Allah be pleased with him) in the Saqifah of Banu Sa'idah and said: "One leader from us and one leader from you." So Sayyiduna Abu Bakr, Sayyiduna Umar and Sayyiduna Abu Ubaydah bin al-Jarrah (may Allah be pleased with them) went to them. Sayyiduna Umar (may Allah be pleased with him) wanted to speak, but Sayyiduna Abu Bakr (may Allah be pleased with him) silenced him. Umar (may Allah be pleased with him) used to say: "By Allah, I only intended by that (to speak first) because I had prepared a speech that pleased me, and I feared that Abu Bakr would not reach (its level)." Then Sayyiduna Abu Bakr (may Allah be pleased with him) spoke, and spoke most eloquently, and said in his speech: "We are the leaders and you are the ministers." Sayyiduna al-Hubab bin al-Mundhir (may Allah be pleased with him) said: "No, by Allah! We will never do that; one leader from us and one leader from you." Sayyiduna Abu Bakr (may Allah be pleased with him) said: "No, rather we are the leaders and you are the ministers. They (Quraysh) are the most central of the Arabs in home and the most noble of them in lineage, so pledge allegiance to Umar bin al-Khattab or Abu Ubaydah bin al-Jarrah (may Allah be pleased with them both)." Sayyiduna Umar (may Allah be pleased with him) said: "Rather, we pledge allegiance to you. You are the best of us, our leader, and the most beloved of us to the Messenger of Allah (peace and blessings be upon him)." Then Sayyiduna Umar (may Allah be pleased with him) took his hand and pledged allegiance to him, and all the people pledged allegiance to him. Someone said: "You have killed Sa'd bin Ubadah." Sayyiduna Umar (may Allah be pleased with him) said: "Allah has killed him."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب قتال أهل البغي / 16536