Build a masjid, receive a house in Paradise

Whoever builds a masjid for Allah, Allah builds him a house in Paradise.

Narrated by Uthman ibn Affan

Whoever builds a masjid seeking the pleasure of Allah, Allah will build for him a house like it in Paradise.

Sahih al-Bukhari 450, Sahih Muslim 533

What this hadith teaches

Helping to build, extend or maintain a masjid, even with a small share, enters this reward.

Reference and grade

Grade
Sahih: agreed upon by al-Bukhari and Muslim
Narrator
Uthman ibn Affan
Chapter
The masjid

The hadith in Arabic نص الحديث

مَنْ بَنَى مَسْجِدًا ـ قَالَ بُكَيْرٌ حَسِبْتُ أَنَّهُ قَالَ ـ يَبْتَغِي بِهِ وَجْهَ اللَّهِ، بَنَى اللَّهُ لَهُ مِثْلَهُ فِي الْجَنَّةِ

Arabic text of Sahih al-Bukhari 450, as given on sunnah.com.