The reward of one who prays twelve rak'ahs apart from the prescribed prayers during the day and night
أَخْبَرَنَا مُحَمَّدُ بْنُ مَعْدَانَ بْنِ عِيسَى، قَالَ حَدَّثَنَا الْحَسَنُ بْنُ أَعْيَنَ، قَالَ حَدَّثَنَا مَعْقِلٌ، عَنْ عَطَاءٍ، قَالَ أُخْبِرْتُ أَنَّ أُمَّ حَبِيبَةَ بِنْتَ أَبِي سُفْيَانَ قَالَتْ سَمِعْتُ رَسُولَ اللَّهِ صلى الله عليه وسلم يَقُولُ " مَنْ رَكَعَ ثِنْتَىْ عَشْرَةَ رَكْعَةً فِي يَوْمِهِ وَلَيْلَتِهِ سِوَى الْمَكْتُوبَةِ بَنَى اللَّهُ لَهُ بِهَا بَيْتًا فِي الْجَنَّةِ " .
It was narrated that 'Ata said: "I was told that Umm Habibah bin Abi Sufyan said: "I heard the Messenger of Allah (ﷺ) say: 'Whoever prays twelve rak'ahs during the day and night, apart from the prescribed prayers, Allah (SWT) will build for him a house in Paradise.'"