(65) باب مَنْ بَنَى مَسْجِدًا
Narrated 'Ubaidullah Al-Khaulani:
I heard `Uthman bin `Affan saying, when people argued too much about his intention to reconstruct the mosque of Allah's Messenger (ﷺ), "You have talked too much. I heard the Prophet (ﷺ) saying, 'Whoever built a mosque, (Bukair thought that `Asim, another sub-narrator, added, "Intending Allah's Pleasure"), Allah would build for him a similar place in Paradise.' "
Reference: Sahih al-Bukhari 450
In-book reference: Book 8, Hadith 99
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 1, Book 8, Hadith 441