Sunan Abu Dawud 1250
Prayer (Kitab Al-Salat): Voluntary Prayers
حَدَّثَنَا مُحَمَّدُ بْنُ عِيسَى، حَدَّثَنَا ابْنُ عُلَيَّةَ، حَدَّثَنَا دَاوُدُ بْنُ أَبِي هِنْدٍ، حَدَّثَنِي النُّعْمَانُ بْنُ سَالِمٍ، عَنْ عَمْرِو بْنِ أَوْسٍ، عَنْ عَنْبَسَةَ بْنِ أَبِي سُفْيَانَ، عَنْ أُمِّ حَبِيبَةَ، قَالَتْ قَالَ النَّبِيُّ صلى الله عليه وسلم " مَنْ صَلَّى فِي يَوْمٍ ثِنْتَىْ عَشْرَةَ رَكْعَةً تَطَوُّعًا بُنِيَ لَهُ بِهِنَّ بَيْتٌ فِي الْجَنَّةِ " .
Narrated Umm Habibah: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)
Grading: Al-Albani: Sahih · Muhammad Muhyi Al-Din Abdul Hamid: Sahih · Shuaib Al Arnaut: Sahih · Zubair Ali Zai: Sahih Muslim (728)
Text from the public-domain hadith-api dataset. Numbering follows that dataset and can differ by a few from some printed editions — check the wording, not only the number.