Etiquettes of the House of Allah

The Masjid is distinctly celebrated for the observance of many of the
great and beloved acts of good deeds, such as the plentiful
Remembrances of Allāh, establishment of prayer, recitation of the
Qur'ān, circles of knowledge and learning the religion of Allāh. On the
contrary, the marketplace is fraught with unlawful transactions, bad
deeds and other abominable acts that are habitual of marketplaces.
It's enough of an honor for the Masjid to be called the House of Allāh.
Allāh attributed it to Himself in order to honor it, glorify its status and
display its lofty standing. Allāh says,
“And the Mosques are for Allāh (Alone), so invoke not anyone along
with Allāh.”［Sūrah al-Jinn 72:18]
And,
“In Houses (Mosques), which Allāh has ordered to be raised (to be
cleaned and to be honored), in them His Name is glorified in the
mornings and in the afternoons or the evenings. Men whom neither
trade nor sale diverts them from the Remembrance of Allāh (with
heart and tongue), nor from performing As-Salāt （Iqāmat-as-Salāt).” [Sūrah An-Nūr 24:36-37]