12 rakat sunnah:
أَخْبَرَنَا أَحْمَدُ بْنُ يَحْيَى، قَالَ حَدَّثَنَا مُحَمَّدُ بْنُ بِشْرٍ، قَالَ حَدَّثَنَا أَبُو يَحْيَى، إِسْحَاقُ بْنُ سُلَيْمَانَ الرَّازِيُّ عَنِ الْمُغِيرَةِ بْنِ زِيَادٍ، عَنْ عَطَاءِ بْنِ أَبِي رَبَاحٍ، عَنْ عَائِشَةَ، رضى الله عنها عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ “ مَنْ ثَابَرَ عَلَى اثْنَتَىْ عَشْرَةَ رَكْعَةً بَنَى اللَّهُ عَزَّ وَجَلَّ لَهُ بَيْتًا فِي الْجَنَّةِ أَرْبَعًا قَبْلَ الظُّهْرِ وَرَكْعَتَيْنِ بَعْدَ الظُّهْرِ وَرَكْعَتَيْنِ بَعْدَ الْمَغْرِبِ وَرَكْعَتَيْنِ بَعْدَ الْعِشَاءِ وَرَكْعَتَيْنِ قَبْلَ الْفَجْرِ ” .
It was narrated from Aishah that: The Messenger of Allah (ﷺ) said: “Whoever persists in praying twelve rak’ahs(12 rakat sunnah:) each day and night, Allah, the Mighty and Sublime, will build for him a house in Paradise: Four before Zuhr and two after Zuhr, two rak’ahs after Maghrib, two rak’ahs after Isha’ and two rak’ahs of Fajr.”
Sunan an-Nasa’i(Nasai) 1795
Chapter 66: The reward of one who prays twelve rak’ahs apart from the prescribed prayers during the day and night, Book 20: The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day
Grade: Hasan (Darussalam)
https://sunnah.com/nasai:1795
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.'”
Sunan an-Nasa’i 1796
Chapter 66: The reward of one who prays twelve rak’ahs apart from the prescribed prayers during the day and night, Book 20: The Book of Qiyam Al-Lail (The Night Prayer) and Voluntary Prayers During the Day
Grade: Sahih (Darussalam)
https://sunnah.com/nasai:1796