Chapter: If The Imam Experiences An Excuse, From Illness, Or Travelling, Etc. He May Appoint Someone Else To Lead The People In Prayer; The One Who Offers Prayer Behind The Imam Sitting Because He Is Unable To Stand Must Stand If He Is Able To Do So; And The Abrogation Of Sitting Behind A Sitting Imam For Those Who Are Able To Stand
A'mash reported: When the Messenger of Allah ( صلی اللہ علیہ وسلم ) suffered from illness of which he died, and in the hadith transmitted by Ibn Mus-hir, the words are: The Messenger of Allah ( صلی اللہ علیہ وسلم ) was brought till he was seated by his (Abu Bakr's) side and the Apostle ( صلی اللہ علیہ وسلم ) led the people in prayer and Abu Bakr was making takbir audible to them, and in the hadith transmitted by 'Isa the (words are): The Messenger of Allah ( صلی اللہ علیہ وسلم ) sat and led the people in prayer and Abu Bakr was by his side and he was making (takbir) audible to the people.
Authentic