Musannaf Ibn Abi Shaybah 2854 — The prayer of a sick person

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.