“I suffered from Nasur* and I asked the Prophet ﷺ about prayer. He said: ‘Perform prayer standing; if you cannot, then sitting; and if you cannot then while lying on your side.’”  

كَانَ بِي النَّاصُورُ فَسَأَلْتُ النَّبِيَّ ﷺ عَنِ الصَّلاَةِ فَقَالَ صَلِّ قَائِمًا فَإِنْ لَمْ تَسْتَطِعْ فَقَاعِدًا فَإِنْ لَمْ تَسْتَطِعْ فَعَلَى جَنْبٍ  

“I saw the Prophet ﷺ performing prayer while sitting on his right side when he was sick.”  

رَأَيْتُ النَّبِيَّ ﷺ صَلَّى جَالِسًا عَلَى يَمِينِهِ وَهُوَ وَجِعٌ