ENOfficial
‘A’isha said, “When God’s Messenger grew old and was ill, he mostly prayed sitting.” (Bukhari and Muslim.)
Source: sunnah.com
Other translations
Arabic
وَعَنْ عَائِشَةَ رَضِيَ اللَّهُ عَنْهَا قَالَتْ: لَمَّا بَدَّنَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ وَثَقُلَ كَانَ أَكْثَرُ صَلَاتِهِ جَالِسًا
sunnah.com