The Prophet ﷺ as saying: If anyone prays in a day and a night twelve rak'ahs voluntarily (supererogatory prayer), a house will be built from him in Paradise on account of these (rak'ahs).  

قَالَ النَّبِيُّ ﷺ مَنْ صَلَّى فِي يَوْمٍ ثِنْتَىْ عَشْرَةَ رَكْعَةً تَطَوُّعًا بُنِيَ لَهُ بِهِنَّ بَيْتٌ فِي الْجَنَّةِ  

I asked A'ishah about the voluntary prayers offered by the Messenger of Allah ﷺ. She replied: Before the noon prayer he would pray four rak'ahs in my house, then go out and lead the people in prayer, then return to my house and pray two rak'ahs. He would lead the people in the sunset prayer, then return to my house and pray two rak'ahs. Then he would lead the people in the night prayer, and enter my house and pray two rak'ahs. He would pray nine rak'ahs during the night, including witr (prayer). At night he would pray for a long time standing and for a long time sitting. When he recited the Qur'an while standing, he would bow and prostrate himself from the standing position, and when he recited while sitting, he would bow and prostrate himself from the sitting position, and when dawn came he prayed two rak'ahs, then he would come out and lead the people in the dawn prayer.  

عَنْ صَلاَةِ رَسُولِ اللَّهِ ﷺ مِنَ التَّطَوُّعِ فَقَالَتْ كَانَ يُصَلِّي قَبْلَ الظُّهْرِ أَرْبَعًا فِي بَيْتِي ثُمَّ يَخْرُجُ فَيُصَلِّي بِالنَّاسِ ثُمَّ يَرْجِعُ إِلَى بَيْتِي فَيُصَلِّي رَكْعَتَيْنِ وَكَانَ يُصَلِّي بِالنَّاسِ الْمَغْرِبَ ثُمَّ يَرْجِعُ إِلَى بَيْتِي فَيُصَلِّي رَكْعَتَيْنِ وَكَانَ يُصَلِّي بِهِمُ الْعِشَاءَ ثُمَّ يَدْخُلُ بَيْتِي فَيُصَلِّي رَكْعَتَيْنِ وَكَانَ يُصَلِّي مِنَ اللَّيْلِ تِسْعَ رَكَعَاتٍ فِيهِنَّ الْوِتْرُ وَكَانَ يُصَلِّي لَيْلاً طَوِيلاً قَائِمًا وَلَيْلاً طَوِيلاً جَالِسًا فَإِذَا قَرَأَ وَهُوَ قَائِمٌ رَكَعَ وَسَجَدَ وَهُوَ قَائِمٌ وَإِذَا قَرَأَ وَهُوَ قَاعِدٌ رَكَعَ وَسَجَدَ وَهُوَ قَاعِدٌ وَكَانَ إِذَا طَلَعَ الْفَجْرُ صَلَّى رَكْعَتَيْنِ ثُمَّ يَخْرُجُ فَيُصَلِّي بِالنَّاسِ صَلاَةَ الْفَجْرِ ﷺ  

The Messenger of Allah ﷺ would pray two rak'ahs before and two after the noon prayer, two after the sunset prayer in his house, and two after the night prayer. He would not pray after the Friday prayer till he departed. He would then pray two rak'ahs.  

أَنَّ رَسُولَ اللَّهِ ﷺ كَانَ يُصَلِّي قَبْلَ الظُّهْرِ رَكْعَتَيْنِ وَبَعْدَهَا رَكْعَتَيْنِ وَبَعْدَ الْمَغْرِبِ رَكْعَتَيْنِ فِي بَيْتِهِ وَبَعْدَ صَلاَةِ الْعِشَاءِ رَكْعَتَيْنِ وَكَانَ لاَ يُصَلِّي بَعْدَ الْجُمُعَةِ حَتَّى يَنْصَرِفَ فَيُصَلِّي رَكْعَتَيْنِ  

The Prophet ﷺ never omitted four rak'ahs before the noon prayer, and two rak'ahs before the dawn prayer.  

أَنَّ النَّبِيَّ ﷺ كَانَ لاَ يَدَعُ أَرْبَعًا قَبْلَ الظُّهْرِ وَرَكْعَتَيْنِ قَبْلَ صَلاَةِ الْغَدَاةِ