Sahih Muslim 728
صحيح مسلم#728Sahihحَدَّثَنِي أَبُو غَسَّانَ الْمِسْمَعِيُّ، حَدَّثَنَا بِشْرُ بْنُ الْمُفَضَّلِ، حَدَّثَنَا دَاوُدُ، عَنِ النُّعْمَانِ بْنِ سَالِمٍ، بِهَذَا الإِسْنَادِ " مَنْ صَلَّى فِي يَوْمٍ ثِنْتَىْ عَشْرَةَ سَجْدَةً تَطَوُّعًا بُنِيَ لَهُ بَيْتٌ فِي الْجَنَّةِ " .
Nu'man b. Salim reported with the same chain of transmitters:He who observed twelve voluntary rak'ahs, a house will be built for him in Paradise
Scholarly Authentication
The label above is the grade most of these scholars gave, each scholar counted once — one dissenting opinion no longer speaks for all of them. If any scholar calls a narration fabricated, that verdict is shown instead, whatever the others say. When they judged only its chain of narrators (“Isnaad”), the label says “Sound chain”. Each scholar's own wording:
Every narration in Sahih Muslim is accepted as Sahih (authentic) by the established status of the book.
Sahih Muslim 728 is the standard (Abd al-Baqi) number; this narration is #1695 in the MuslimGPT index.
In-book reference: 6:125