"Whoever prays twelve rak'ahs during the night and day other than the prescribed prayers, a house will be built for him in Paradise: four before Zuhr and two rak'ahs afterward, two before Asr, two after Maghrib and two before Fajr." (Using translation from Nasāʾī 1803)
«مَنْ صَلَّى فِي الْيَوْمِ وَاللَّيْلَةِ ثِنْتَيْ عَشْرَةَ رَكْعَةً سِوَى الْمَكْتُوبَةِ بُنِيَ لَهُ بَيْتٌ فِي الْجَنَّةِ أَرْبَعَ رَكَعَاتٍ قَبْلَ الظُّهْرِ وَرَكْعَتَيْنِ بَعْدَهَا وَثِنْتَيْنِ قَبْلَ الْعَصْرِ وَثِنْتَيْنِ بَعْدَ الْمَغْرِبِ وَثِنْتَيْنِ قَبْلَ الْفَجْرِ»