أَخْبَرَنَا أَبُو الأَشْعَثِ، عَنْ يَزِيدَ بْنِ زُرَيْعٍ، قَالَ أَنْبَأَنَا الْجُرَيْرِيُّ، عَنْ عَبْدِ اللَّهِ بْنِ شَقِيقٍ، قَالَ قُلْتُ لِعَائِشَةَ هَلْ كَانَ رَسُولُ اللَّهِ صلى الله عليه وسلم يُصَلِّي وَهُوَ قَاعِدٌ قَالَتْ نَعَمْ بَعْدَ مَا حَطَمَهُ النَّاسُ ‏.‏

It was narrated that Abdullah bin Shaqiq said: "I said to Aishah: 'Did the Messenger of Allah (PBUH) pray sitting down?' She said: 'Yes, after the people had worn him out.'" Translation Not Available

Book Ref: Sunan An Nisai Book 20 Hadith 1657
Web Ref:  Sunan An Nisai Vol 2 Book 20 Hadith 1658

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