The Book of Prayers (Kitab Al-Salat) 
Muslim :: Book 4 : Hadith 1593
'Abdullah b. Shaqiq reported: I asked 'A'isha whether the Apostle of Allah (may peace be upon him) observed (Nafl) sitting. She said: Yes, when the people had made him old.
The Book of Prayers (Kitab Al-Salat)
Muslim :: Book 4 : Hadith 1593
'Abdullah b. Shaqiq reported: I asked 'A'isha whether the Apostle of Allah (may peace be upon him) observed (Nafl) sitting. She said: Yes, when the people had made him old.