The Messenger of Allah said: "Whoever builds a mosque for the sake of Allah, like a sparrow's nest for Allah or even smaller, Allah will build for him a house in Paradise."
Sunan Ibn Majah Book 4, Hadith 4
← Previous Hadith "The Messenger of Allah said: 'Whoever builds a mosque for the sake of Allah (from his own wealth), Allah will build a house for him in Paradise.'"

Sunan Ibn Majah Book 4, Hadith 3 Next Hadith → "The Messenger of Allah said: 'The Hour will not begin until the people compete in (building) mosques.'"

Sunan Ibn Majah Book 4, Hadith 5