Mishkat al-Masabih #649
Prayer
The Arabic includes the chain of narration (sanad) and the collector's commentary; the English translation shows the Prophet's words only.
وَعَنْ عُثْمَانَ رَضِيَ اللَّهُ عَنْهُ قَالَ: قَالَ رَسُولُ اللَّهِ صلى الله عَلَيْهِ وَسَلَّمَ: «مَنْ بَنَى لِلَّهِ مَسْجِدًا بَنَى اللَّهُ لَهُ بَيْتًا فِي الْجَنَّةِ»
‘Uthman reported God's Messenger as saying, “If anyone builds a mosque for God, God will build a house for him in paradise.”
(Bukhari and Muslim.)
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About Mishkat al-Masabih
This hadith is #649 from Mishkat al-Masabih, in the Book of Prayer.