Narrated 'Imran bin Husain (RA): Allah's Messenger ( صلی اللہ علیہ وسلم ) said: "Pray standing and if you are unable, pray sitting and if you cannot, pray lying on your side, [otherwise pray by signs] ." [Reported by al-Bukhari, (without the final words)] .

Narrated Jabir (RA): The saying of the Prophet ( صلی اللہ علیہ وسلم ) to a sick person who prayed on a cushion: The Prophet ( صلی اللہ علیہ وسلم ) threw it away and said, "Pray on the ground, if you are able to do so; otherwise, pray by gesturing signs and make your prostration lower than your bowing." [al-Baihaqi reported it through a strong chain of narrators, but Abu Hatim regarded it as Mauquf (saying of a Companion)] .