Supplication Upon entering the mosque:
أَعُوذُ بِاللهِ الْعَظِيمِ وَبِوَجْهِهِ الْكَرِيمِ وَسُلْطَانِهِ الْقَدِيمِ مِنَ الشَّيْطَانِ الرَّجِيمِ
I seek refuge with Allah, The Supreme and with His Noble Face, and His eternal authority from the accursed devil. (Reference: Abu Dawud)
اللَّهُمَّ افْتَحْ لِي أَبْوَابَ رَحْمَتِكَ
“O Allah, open the doors of mercy”. (Mishkat)