Narrator:Anas ibn Mālik
وَقَدْ رُوِيَ عَنِ النَّبِيِّ صلى الله عليه وسلم أَنَّهُ قَالَ
" مَنْ بَنَى لِلَّهِ مَسْجِدًا صَغِيرًا كَانَ أَوْ كَبِيرًا بَنَى اللَّهُ لَهُ بَيْتًا فِي الْجَنَّةِ "
It has been related that :
the Prophet said: "Whoever builds a Masjid for (the sake of) Allah, be it small or large, then Allah will build a house for him in Paradise."
Reported by At-Tirmidhi (No. 319).