What does the Muslim say when he enters the mosque?

أَعُوذُ بِاللهِ العَظِيمِ، 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.

اللهُمَّ افْتَحْ لِي أَبْوَابَ رَحْمَتِكَ

O Allah, open the gates of Your mercy for me.