(2) باب تَشْيِيدِ الْمَسَاجِدِ
It was narrated that Anas bin Malik said:
"The Messenger of Allah said: 'The Hour will not begin until the people compete in (building) mosques.'"
Reference: Sunan Ibn Majah 739
In-book reference: Book 4, Hadith 5
English translation: Vol. 1, Book 4, Hadith 739