Numan bin Salim reported,

With this chain of narration, "Whoever prays twelve prostrations as voluntary prayer in a day will have a house built for him in Paradise."

Muslim 1695

Sahih

حدثني أبو غسان المسمعي حدثنا بشر بن المفضل حدثنا داود

عن النعمان بن سالم

بهذا الإسناد من صلى في يوم ثنتي عشرة سجدة تطوعا بني له بيت في الجنة

مسلم 1695صحيح
Contents
Reference
Commentary
Ayat
Collection
Sahih Muslim
Book
Travelers' prayer and its shortening
Chapter
Virtue of the regular sunnah prayers before and after the obligatory prayers, and clarification of their number
Numbering
Darussalam 1695
Muslim 1695