Sahih Bukhari | Volume 1 | Hadith Number 441

I heard 'Uthman bin 'Affan saying, when people argued too much about his intention to reconstruct the mosque of Allah's Apostle, "You have talked too much. I heard the Prophet 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.'"