Sunan Ibn Majah, Volume 1, Book 4, Hadith 737 (DarusSalam) ⓘ
It was narrated that 'Ali bin Abu Talib said: "The Messenger of Allah said: 'Whoever builds a mosque for the sake of Allah (from his own wealth), Allah will build a house for him in Paradise.'"
حَدَّثَنَا الْعَبَّاسُ بْنُ عُثْمَانَ الدِّمَشْقِيُّ، حَدَّثَنَا الْوَلِيدُ بْنُ مُسْلِمٍ، عَنِ ابْنِ لَهِيعَةَ، حَدَّثَنِي أَبُو الأَسْوَدِ، عَنْ عُرْوَةَ، عَنْ عَلِيِّ بْنِ أَبِي طَالِبٍ، قَالَ قَالَ رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ " مَنْ بَنَى لِلَّهِ مَسْجِدًا مِنْ مَالِهِ بَنَى اللَّهُ لَهُ بَيْتًا فِي الْجَنَّةِ " .
also referenced under: Hadith 737 (Reference) & Book 4, Hadith 3 (In-Book)