ENOfficial
It was narrated from 'Amr bin Shu'aib from his father that his grandfather said: "The Messenger of Allah (ﷺ) forbade buying and selling in the mosque, and reciting poetry in the mosque."
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا عَبْدُ اللَّهِ بْنُ سَعِيدٍ الْكِنْدِيُّ، حَدَّثَنَا أَبُو خَالِدٍ الأَحْمَرُ، عَنِ ابْنِ عَجْلاَنَ، عَنْ عَمْرِو بْنِ شُعَيْبٍ، عَنْ أَبِيهِ، عَنْ جَدِّهِ، قَالَ نَهَى رَسُولُ اللَّهِ ـ صلى الله عليه وسلم ـ عَنِ الْبَيْعِ وَالاِبْتِيَاعِ وَعَنْ تَنَاشُدِ الأَشْعَارِ فِي الْمَسَاجِدِ .
sunnah.com