Hanafi
The sources give no view for it here.
البيع في المساجد
هل يجوز البيع في المساجد؟
Each school’s answer
In our wordsHanafi
Not stated in the sources
Maliki
Not stated in the sources
Shafi'i
Not stated in the sources
Hanbali
Not stated in the sources
The texts
٥٠٤ - مَسْأَلَةٌ: وَالْبَيْعُ جَائِزٌ فِي الْمَسَاجِدِ قَالَ اللَّهُ تَعَالَى: {وَأَحَلَّ اللَّهُ الْبَيْعَ} [البقرة: ٢٧٥] وَلَمْ يَأْتِ نَهْيٌ عَنْ ذَلِكَ إلَّا مِنْ طَرِيقِ عَمْرِو بْنِ شُعَيْبٍ عَنْ أَبِيهِ عَنْ جَدِّهِ، وَهِيَ صَحِيفَتُهُ. [مَسْأَلَةٌ الصَّلَاةُ الْوُسْطَى]
From the schools’ own books
Maliki
The sources give no view for it here.
Shafi'i
The sources give no view for it here.
Hanbali
The sources give no view for it here.
What is «in our words» is our standard wording; the books’ texts stay as they are.