(16) باب جَوَازِ النَّافِلَةِ قَائِمًا وَقَاعِدًا وَفِعْلِ بَعْضِ الرَّكْعَةِ قَائِمًا وَبَعْضِهَا قَاعِدًا
'A'isha reported that the Messenger of Allah (ﷺ) would pray in the night for a long time, and when he prayed standing be bowed in a standing posture, and when he prayed sitting, he bowed in a sitting posture. (IT)
Reference (IT): Sahih Muslim 730 b (IT)
In-book reference (IT): Book 6, Hadith 130 (IT)
USC-MSA web (English) reference(deprecated numbering scheme): Book 4, Hadith 1585 (IT)