ibn Umar · The Book On The Mosques And The Congregations

"The Messenger of Allah said to us: 'Come with me.' So we went to the house of 'Aishah, where we ate and drank. Then the Messenger of Allah said to us: 'If you want, you can sleep here, or if you want you can go out to the mosque.' We said: 'We will go out to the mosque.'"

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. '"