"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].
'
Amr bin Shu'aib on the authority of his grandfather (May Allah be pleased with him) said:
The Messenger of Allah (ﷺ) prohibited (us) from buying and selling in the mosque; (he also prohibited us from) making announcement in it about something lost and from reciting poems in it.

[Abu Dawud and At- Tirmidhi]."

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