Sahih Muslim 418 f

'A'isha reported: When the Messenger of Allah (ﷺ) was confined to bed, Bilal came to him to summon him to prayer. He (the Prophet) said: Ask Abu Bakr to lead the people in prayer. She ('A'isha) reported: I said: Messenger of Allah, Abu Bakr is a tenderhearted man, when he would stand at your place (he would be so overwhelmed by feelings) that he would not be able to make the people hear anything (his recitation would not be audible to the followers in prayer). You should better order Umar (to lead the prayer). He (the Prophet) said: Ask Abu Bakr to lead people in prayer. She ('A'isha) said: I asked Hafsa to (convey) my impression to him (the Prophet) that Abu Bakr was a tenderhearted man, so when he would stand at his place, he would not be able to make the people bear anything. He better order Umar. Hafsa conveyed this (message of Hadrat 'A'isha) to him (the Prophet). The Messenger of Allah (ﷺ) said: (You are behaving) as if you are the females who had gathered around Yusuf. Order Abu Bakr to lead the people in prayer. She ('A'isha) reported: So Abu Bakr was ordered to lead the people in prayer. As the prayer began, the Messenger of Allah (ﷺ) felt some relief; he got up and moved supported by two persons and his feet dragged on earth (due to excessive weakness). 'A'isha reported: As he (the Prophet) entered the mosque. Abu Bakr perceived his (arrival). He was about to withdraw, but the Messenger of Allah (ﷺ) by the gesture (of his hand) told him to keep standing at his place. The Messenger of Allah (ﷺ) came and seated himself on the left side of Abu Bakr. She ('A'isha) reported: The Messenger of Allah (ﷺ) was leading people in prayer sitting. Abu Bakr was following the prayer of the Messenger (ﷺ) in a standing posture and the people were following the prayer of Abu Bakr.