Hadith 802 - The Book On The Mosques And The Congregations - Sunan Ibn Majah - سنن ابن ماجه - Collection of Actions, Sayings and Teachings of Prophet Muhammad (صلى الله عليه و سلم) - Kutub as-Sittah

4. The Book On The Mosques And The Congregations - كتاب المساجد والجماعات

19) Chapter: Staying In The Mosques And Awaiting The Prayer

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: 802
English reference: Vol. 1, Book 4, Hadith 802
In-book reference: Book 4, Hadith 68
Grade: Daif (Darussalam)
Read this hadith from Darussalam Collection

19) باب لُزُومِ الْمَسَاجِدِ وَانْتِظَارِ الصَّلاَةِ ‏

حَدَّثَنَا أَبُو كُرَيْبٍ، حَدَّثَنَا رِشْدِينُ بْنُ سَعْدٍ، عَنْ عَمْرِو بْنِ الْحَارِثِ، عَنْ دَرَّاجٍ، عَنْ أَبِي الْهَيْثَمِ، عَنْ أَبِي سَعِيدٍ، عَنْ رَسُولِ اللَّهِ ـ صلى الله عليه وسلم ـ قَالَ ‏"‏ إِذَا رَأَيْتُمُ الرَّجُلَ يَعْتَادُ الْمَسَاجِدَ فَاشْهَدُوا لَهُ بِالإِيمَانِ قَالَ اللَّهُ تَعَالَى ‏{إِنَّمَا يَعْمُرُ مَسَاجِدَ اللَّهِ مَنْ آمَنَ بِاللَّهِ}‏ الآيَةَ ‏.‏