Aswad reported,

We were with Ayesha and we mentioned the importance of being constant in prayer and holding it in great regard. She said, "When the Messenger of Allah ﷺ fell into the illness from which he died, the time for prayer came and the call to prayer was made. He said, 'Tell Abu Bakr to lead the people in prayer.'It was said to him, 'Abu Bakr is a tender-hearted man. If he stands in your place, he will not be able to lead the people in prayer.'He repeated his command, and they repeated their objection. He said it a third time and then said, 'You are like the companions of Yusuf. Tell Abu Bakr to lead the people in prayer.'So Abu Bakr went out and prayed. Then the Prophet ﷺ felt some relief in himself, so he came out supported between two men. It is as though I can still see his feet dragging along the ground from the pain. Abu Bakr wanted to step back, but the Prophet ﷺ gestured to him to stay in his place. Then he was brought forward until he sat down beside him."Amash was asked, "Was the Prophet ﷺ praying while Abu Bakr was following his prayer and the people were following the prayer of Abu Bakr?"He nodded with his head, "Yes."Abu Dawud narrated part of it from Shuba from Amash. Abu Muawiya added that he sat to the left of Abu Bakr, and Abu Bakr was praying standing.

حدثنا عمر بن حفص بن غياث قال حدثني أبي قال حدثنا الأعمش عن إبراهيم

عن الأسود قال

كنا عند عائشة رضي الله عنها فذكرنا المواظبة على الصلاة والتعظيم لها قالت لما مرض رسول الله ﷺ مرضه الذي مات فيه فحضرت الصلاة فأذن فقال مروا أبا بكر فليصل بالناس فقيل له إن أبا بكر رجل أسيف إذا قام في مقامك لم يستطع أن يصلي بالناس وأعاد فأعادوا له فأعاد الثالثة فقال إنكن صواحب يوسف مروا أبا بكر فليصل بالناس فخرج أبو بكر فصلى فوجد النبي ﷺ من نفسه خفة فخرج يهادى بين رجلين كأني أنظر رجليه تخطان من الوجع فأراد أبو بكر أن يتأخر فأومأ إليه النبي ﷺ أن مكانك ثم أتي به حتى جلس إلى جنبه قيل للأعمش وكان النبي ﷺ يصلي وأبو بكر يصلي بصلاته والناس يصلون بصلاة أبي بكر فقال برأسه نعم رواه أبو داود عن شعبة عن الأعمش بعضه وزاد أبو معاوية جلس عن يسار أبي بكر فكان أبو بكر يصلي قائما