1696/1 - Abu Hurayrah (may Allah be pleased with him) reported that he heard the Prophet (may Allah’s peace and blessings be upon him) say: “Whoever hears a man inquiring in the mosque about something he has lost should say: ‘May Allah not return it to you,’ for indeed mosques are not built for this.” [Narrated by Muslim]
1697/2 - He also reported that the Prophet (may Allah’s peace and blessings be upon him) said: “If you see someone buying or selling in the mosque, say to him: ‘May Allah not make your sale profitable.’ And if you see someone inquiring about a lost item in the mosque, say: ‘May Allah not return it to you.’”
[Narrated by Al-Tirmidhi; he classified it as Hasan (sound)]
1698/3 - Buraydah (may Allah be pleased with him) reported that a man inquired in the mosque about something lost, saying: “Has anyone seen the red camel?” Thereupon, the Messenger of Allah (may Allah’s peace and blessings be upon him) said: “May you not find it. Indeed, mosques are built for what they are built for.” [Narrated by Muslim]
1699/4 - ‘Amr ibn Shu‘ayb related from his father that his grandfather reported that the Messenger of Allah (may Allah’s peace and blessings be upon him) forbade buying and selling in the mosque, inquiring about a lost item in it, or saying poetry therein. [Narrated by Abu Dāwūd and Al-Tirmidhi, who classified it as Hasan (sound)]
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1) It is prohibited to inquire about a lost item in the mosque, given its great status and to avoid distracting the worshipers.
2) It is prohibited to buy or sell in the mosque. This applies to both the buyer and the seller.
3) We are encouraged to frequently remember Allah Almighty, recite the Qur’an, seek Shariah knowledge, and establish prayers in the mosques. Indeed, this is the purpose behind constructing them.
4) it is prohibited to recite idle poetry in the mosque. As for such poems that involve wisdom and asceticism and encourage obedience to Allah and Jihad in His cause, it is recommended and desirable to recite them.
1700/5 - Al-Sā’ib ibn Yazīd (may Allah be pleased with him) reported: “I was in the mosque when a man threw a pebble at me. I looked and it was ‘Umar ibn al-Khattāb (may Allah be pleased with him). He said: ‘Go and bring me these two.’ So, I brought them to him. He said: ‘Where are you from?’ They said: ‘From the people of Tā’if.’ He said: ‘If you had been from this city [of us], I would have inflicted pain on you. You raise your voices in the Prophet’s Mosque!’” [Narrated by Al-Bukhāri]
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1) It is prohibited to raise our voices in the mosque, lest we should distract the worshipers.
2) We are exhorted to respect mosques in general and the Prophet’s Mosque in particular, given its special inviolability and merit. This falls under revering the rituals of Allah Almighty.