Hadithcore
Riyad as-Salihin, 1697

Abu Hurairah (May Allah be pleased with him) said:

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!"' <b>[At-Tirmidhi]</b>.

وعنه أن رسول الله صلى الله عليه وسلم قال‏:‏ ‏

‏إذا رأيتم من يبيع أو يبتاع في المسجد، فقولوا‏:‏ لا أربح الله تجارتك، وإذا رأيتم من ينشد ضالة فقولوا‏:‏ لا ردها الله عليك‏

‏‏.‏ رواه الترمذي، وقال: (حَدِيثٌ حَسَنٌ).

References1 variant
In-Book Reference
Book 17, Hadith 187
Sharh · explanationclick to expand
<b>Guidance from the Hadiths:</b><br> 1) It is prohibited to inquire about a lost item in the mosque, given its great status and to avoid distracting the worshipers.<br> 2) It is prohibited to buy or sell in the mosque. This applies to both the buyer and the seller.<br> 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.<br> 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.
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