Riyad as-Salihin

Riyad as-Salihin 1697

Undesirability of Quarrelling or Raising voices in the Mosque
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Riyad as-Salihin 1697
Arabic hadith text
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).
Translation
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!"'[At-Tirmidhi].