185. Dua for the person who trades in the mosque
Narrated Abu Hurairah: That the Messenger of Allah (ﷺ) said: "When you see someone selling or buying in the Masjid then say:
لَا أَرْبَحَ اللَّهُ تِجَارَتَكَ
لَا اَرْبَحَ اللّٰهُ تِجَارَتَكَ
laa arba'ha Allahu tijaarataka
Translation
May Allah not profit your business.
This is because the mosques were not built for this purpose.