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

“Whoever performs twelve Rak’ah (of Sunnah) during the day and night, a house will be built for him in Paradise.” (Using translation from Ibn Mājah 1141)

عَنِ النَّبِيِّ ﷺ قَالَ مَنْ صَلَّى فِي يَوْمٍ وَلَيْلَةٍ ثِنْتَيْ عَشْرَةَ سَجْدَةً سِوَى الْمَكْتُوبَةِ بُنِيَ لَهُ بَيْتٌ فِي الْجَنَّةِ

[Machine] "Shu'bah wrote to me and I read to him from Abu Uthman, the freed slave of Al-Mughirah ibn Shu'bah, from Abu Hurairah, who said: Abdullah said, my father said, he did not elevate it. He said, no Muslim servant who prays twelve voluntary rak'ahs in a day, except that a house is built for him in Jannah."

شُعْبَةُ كَتَبَ بِهِ إِلَيَّ فَقَرَأْتُهُ عَلَيْهِ عَنْ أَبِي عُثْمَانَ مَوْلَى الْمُغِيرَةِ بْنِ شُعْبَةَ عَنْ أَبِي هُرَيْرَةَ قَالَ عَبْدُ اللهِ قَالَ أَبِي وَلَمْ يَرْفَعْهُ قَالَ مَا مِنْ عَبْدٍ مُسْلِمٍ يُصَلِّي فِي يَوْمٍ ثِنْتَيْ عَشْرَةَ رَكْعَةً تَطَوُّعًا إِلَّا بُنِيَ لَهُ بَيْتٌ فِي الْجَنَّةِ

[Machine] The Messenger of Allah ﷺ said: "Whoever prays twelve voluntary prostrations, Allah will build a house for him in paradise."

قَالَ رَسُولُ اللَّهِ ﷺ «مَنْ صَلَّى اثْنَتَيْ عَشْرَةَ سَجْدَةً تَطَوُّعًا بَنَى اللَّهُ لَهُ بَيْتًا فِي الْجَنَّةِ»

“Whoever performs twelve Rak’ah (of Sunnah) during the day and night, a house will be built for him in Paradise.” (Using translation from Ibn Mājah 1141)

عَنِ النَّبِيِّ ﷺ قَالَ «مَنْ صَلَّى فِي يَوْمٍ ثِنْتَيْ عَشْرَةَ رَكْعَةً بُنِيَ لَهُ بَيْتٌ فِي الْجَنَّةِ»