It is sunnah to recite the following Duaa when entering the Musjid:
أَعُوذُ بِاللهِ العَظِيمِ وَبِوَجْهِهِ الْكَرِيم وَسُلْطَانِهِ القَدِيم مِنَ الشَّيْطَانِ الرَّجِيم
I seek protection in Allah Ta’ala, the Great, and in His noble Countenance and His eternal might and power from the accursed Shaytaan.…
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