The Messenger of Allah (ﷺ) said: If anyone hears a man crying out in the mosque about something he has lost, he should say: May Allah not restore it to you, for the mosques were not built for this.
Reference: Sahih Muslim 568 a In-book : Book 5, Hadith 98 USC-MSA web (English) : Book 4, Hadith 1153 (deprecated)
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