Uthman ibn Affan reported: The Messenger of Allah, peace and blessings be upon him, said,

“Whoever builds a mosque for Allah, Allah will build for him a house like it in Paradise.”

   Source: Ṣaḥīḥ al-Bukhārī 450, Ṣaḥīḥ Muslim 533  (authenticity agreed upon)

                  عَنْ عُثْمَانَ بْنِ عَفَّانَ قَالَ قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ مَنْ بَنَى مَسْجِدًا لِلَّهِ بَنَى اللَّهُ لَهُ فِي الْجَنَّةِ مِثْلَهُ