রিয়াদুস সালেহীন ১০২০

A man announced (the loss of his camel) in the mosque, uttering these words: "Has any one seen my red camel?" Upon this the Messenger of Allah (ﷺ) said, "May it not be restored to you! The mosques are built for what they are meant to be (i.e., prayer, remembrance of Allah, acquiring knowledge, etc.).".

While I was in the mosque, someone threw a pebble at me, and when I looked up, I saw that it was 'Umar bin Al-Khattab, who said: "Go and call me these two men." I brought them and 'Umar (May Allah be pleased with him) asked them: "Where are you from?" On their replying that they belonged to At-Taif, he said: "Had you been the inhabitants of Al-Madinah, I would have given you a beating for raising your voices in the mosque of the Messenger of Allah (ﷺ).".

The Messenger of Allah said, "When you see someone buying or selling in the mosque, say to him: 'La arbaha-Allahu tijarataka (May Allah not make your bargain profitable)!' When you see someone announcing something lost in it, say: 'May Allah not restore it to you!"'.