Sayyidah Aishah (may Allah be pleased with her) said: When the Messenger of Allah (peace and blessings be upon him) became seriously ill, Sayyiduna Bilal (may Allah be pleased with him) came and informed him (peace and blessings be upon him) of the prayer. He (peace and blessings be upon him) said: "Tell Abu Bakr (may Allah be pleased with him) to lead the people in prayer." Sayyidah Aishah (may Allah be pleased with her) said: I said: O Messenger of Allah! Abu Bakr (may Allah be pleased with him) is a soft-hearted man; how can he stand in your place? Nor will he be able to make the people hear (the Qur'an). If only you would order Umar (may Allah be pleased with him). He (peace and blessings be upon him) said: "Tell Abu Bakr (may Allah be pleased with him) to lead the people in prayer." Sayyidah Aishah (may Allah be pleased with her) said: I said to Sayyidah Hafsah (may Allah be pleased with her): Say to the Messenger of Allah (peace and blessings be upon him) that Abu Bakr (may Allah be pleased with him) is soft-hearted; how can he stand in your (peace and blessings be upon him) place? Nor will he be able to make the people hear (the recitation); if only you would tell Umar (may Allah be pleased with him). So she said it to the Messenger of Allah (peace and blessings be upon him), and the Messenger of Allah (peace and blessings be upon him) said: "You are just like the women of (the story of) Yusuf; go and tell Abu Bakr (may Allah be pleased with him)." So he led the people in prayer. Sayyidah Aishah (may Allah be pleased with her) said: When he (may Allah be pleased with him) had begun the prayer, the Messenger of Allah (peace and blessings be upon him) felt some improvement in himself, and he (peace and blessings be upon him) set out, supported between two men, his legs trailing along the ground. When he (peace and blessings be upon him) entered the mosque, Sayyiduna Abu Bakr (may Allah be pleased with him) sensed his (peace and blessings be upon him) arrival and began to step back, but the Messenger of Allah (peace and blessings be upon him) signalled to him to stay in his place. Then the Messenger of Allah (peace and blessings be upon him) came and sat down on the left side of Sayyiduna Abu Bakr (may Allah be pleased with him). The Messenger of Allah (peace and blessings be upon him) was leading the people in prayer sitting, while Sayyiduna Abu Bakr (may Allah be pleased with him) was standing, following the prayer of the Prophet (peace and blessings be upon him), and the people were following the prayer of Sayyiduna Abu Bakr (may Allah be pleased with him).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصلاة / 3657