In the name of Allah, peace and blessings upon the Messenger of Allah. O Allah, — Mosque Adhkar
بِسْمِ اللَّهِ وَالصَّلَاةُ وَالسَّلَامُ عَلَى رَسُولِ اللَّهِ اللَّهُمَّ اغْفِرْ لِي ذُنُوبِي وَافْتَحْ لِي أَبْوَابَ رَحْمَتِكَ
Transliteration: Bismillaah was-salaatu was-salaamu 'alaa rasoolillaah, Allaahummagh-fir lee dhunoobi waf-tah lee abwaaba rahmatik
Translation: In the name of Allah, peace and blessings upon the Messenger of Allah. O Allah, forgive my sins and open for me the gates of Your mercy. (Entering the mosque)
Reference: Muslim 1:494, Ibn Majah