(16) باب جَوَازِ النَّافِلَةِ قَائِمًا وَقَاعِدًا وَفِعْلِ بَعْضِ الرَّكْعَةِ قَائِمًا وَبَعْضِهَا قَاعِدًا
'Abdullah b. Shaqiq reported:
I fell ill in Persia and therefore, prayed in a sitting posture, and I asked 'A'isha about it and she said: The Messenger of Allah (ﷺ) prayed for a long time in the night sitting.
Reference: Sahih Muslim 730 c
In-book reference: Book 6, Hadith 131
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1586