(19) باب لُزُومِ الْمَسَاجِدِ وَانْتِظَارِ الصَّلاَةِ
It was narrated from Abu Sa'eed that:
The Messenger of Allah said: "If you see a man frequenting the mosques, then bear witness to his faith. Allah says: 'The mosques of Allah shall be maintained only by those who believe in Allah and the Last Day. [At-Taubah: 18]'"
Reference: Sunan Ibn Majah 802
In-book reference: Book 4, Hadith 68
English translation: Vol. 1, Book 4, Hadith 802