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أَعُوذُ بِاللَّهِ الْعَظِيمِ، وَبِوَجْهِهِ الْكَرِيمِ، وَسُلْطَانِهِ الْقَدِيمِ، مِنَ الشَّيْطَانِ الرَّجِيمِ، بِسْمِ اللَّهِ، وَالصَّلَاةُ وَالسَّلَامُ عَلَى رَسُولِ اللَّهِ، اللَّهُمَّ افْتَحْ لِي أَبْوَابَ رَحْمَتِكَ.
When entering: I seek refuge in Allah the Magnificent, in His noble Face, and in His eternal authority, from the accursed devil. In the name of Allah, and prayers and peace be upon the Messenger of Allah. O Allah, open for me the gates of Your mercy.
يُقال عند دخول المسجد.
Abu Dawud & Muslim