عَنِ ابْنِ عَبَّاسٍ رَضِيَ اللَّهُ عَنْهُمَا عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَآلِهِ وَسَلَّمَ أَنَّهُ قَالَ: ((مَنْ بَنَى لِلَّهِ مَسْجِدًا وَلَوْ كَمَفْحَصِ قَطَاةٍ لِبَيْضِهَا بَنَى اللَّهُ لَهُ بَيْتًا فِي الْجَنَّةِ))
It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: "Whoever builds a mosque for Allah, even if it is as small as the nest where a dove lays its eggs, Allah Almighty will build a house for him in Paradise."