Riyad as-Saliheen 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!"'
[At-Tirmidhi].
وعنه أن رسول الله ﷺ قال:
"إذا رأيتم من يبيع أو يبتاع في المسجد، فقولوا: لا أربح الله تجارتك، وإذا رأيتم من ينشد ضالة فقولوا: لا ردها الله عليك".
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References
Riyad as-Saliheen 1697
Riyad as-Saliheen Book of Prohibited actions, Hadith 187