وَقَالَ رَسُولُ اَللَّهِ صَلَّى اَللَّهُ عَلَيْهِ وَ آلِهِ: «اَلْمَرِيضُ يُصَلِّي قَائِماً فَإِنْ لَمْ يَسْتَطِعْ صَلَّى جَالِساً فَإِنْ لَمْ يَسْتَطِعْ صَلَّى عَلَى جَنْبِهِ اَلْأَيْمَنِ فَإِنْ لَمْ يَسْتَطِعْ صَلَّى عَلَى جَنْبِهِ اَلْأَيْسَرِ فَإِنْ لَمْ يَسْتَطِعِ اِسْتَلْقَى وَ أَوْمَأَ إِيمَاءً وَ جَعَلَ وَجْهَهُ نَحْوَ اَلْقِبْلَةِ وَ جَعَلَ سُجُودَهُ أَخْفَضَ مِنْ رُكُوعِهِ.
The Messenger of Allah (saws) said: "A sick person should pray standing, and if he cannot, he should pray sitting. If he cannot do that, he should pray on his right side. If he cannot do that, he should pray on his left side. If he cannot do even that, he should lie down, face the Qibla, and make gestures for his prayers, with his prostration lower than his bowing."