The prayer of a sick person

Abu Khashinah said: I went with al-Hakam bin al-A'raj to Bakr al-Muzani during his illness. He asked us: Have you prayed Asr? We said: Yes. So he stood up and offered a prayer that he kept light on account of his illness.

Raja' bin Rabi'ah said: We were with Sayyiduna Abu Sa'id al-Khudri (may Allah be pleased with him) during his final illness when he fell unconscious. When he came to, we said to him: O Abu Sa'id, it is time for the prayer! He said: Gesturing is enough for me.
Abu Bakr (Ibn Abi Shaybah) said: By his word "kafan" he meant that he would pray by gesturing.

Asim said: Once, while I was ill, Abu Wa'il came to me. I said: O Abu Wa'il, I am a gravely and persistently ill man; shall I still pray? He said: Yes.