Sahih Muslim Book - 6, Hadith - 1699

حَدَّثَنَا يَحْيَى بْنُ يَحْيَى أَخْبَرَنَا هُشَيْمٌ عَنْ خَالِدٍ عَنْ عَبْدِ اللَّهِ بْنِ شَقِيقٍ قَالَ سَأَلْتُ عَائِشَةَ عَنْ صَلاَةِ رَسُولِ اللَّهِ -صلى الله عليه وسلم- عَنْ تَطَوُّعِهِ فَقَالَتْ كَانَ يُصَلِّى فِى بَيْتِى قَبْلَ الظُّهْرِ أَرْبَعًا ثُمَّ يَخْرُجُ فَيُصَلِّى بِالنَّاسِ ثُمَّ يَدْخُلُ فَيُصَلِّى رَكْعَتَيْنِ وَكَانَ يُصَلِّى بِالنَّاسِ الْمَغْرِبَ ثُمَّ يَدْخُلُ فَيُصَلِّى رَكْعَتَيْنِ وَيُصَلِّى بِالنَّاسِ الْعِشَاءَ وَيَدْخُلُ بَيْتِى فَيُصَلِّى رَكْعَتَيْنِ وَكَانَ يُصَلِّى مِنَ اللَّيْلِ تِسْعَ رَكَعَاتٍ فِيهِنَّ الْوِتْرُ وَكَانَ يُصَلِّى لَيْلاً طَوِيلاً قَائِمًا وَلَيْلاً طَوِيلاً قَاعِدًا وَكَانَ إِذَا قَرَأَ وَهُوَ قَائِمٌ رَكَعَ وَسَجَدَ وَهُوَ قَائِمٌ وَإِذَا قَرَأَ قَاعِدًا رَكَعَ وَسَجَدَ وَهُوَ قَاعِدٌ وَكَانَ إِذَا طَلَعَ الْفَجْرُ صَلَّى رَكْعَتَيْنِ.

It was narrated that 'Abdullah bin Shaqiq said: "I asked 'Aishah about the prayer of the Messenger of Allah (s.a.w), and his voluntary prayers. She said: 'He used to pray four Rak'ah in my house before Zuhr, then he would go out and lead the people in prayer. Then he would come in and pray two Rak'ah. He would lead the people in praying Maghrib, then he would come in, and pray two Rak'ah. He would lead the people in praying 'Isha', then he would enter my house, and pray two Rak'ah. He would pray nine Rak'ah at night, including Witr, and he would pray for a long time at night standing, and a long time at night sitting. And if he recited while standing, he would bow and prostrate from a standing position. But if he recited while sitting, he would bow and prostrate from a sitting position. And when dawn broke he would pray two Rak'ah."