اللَّهُمَّ افْتَحْ لِي أَبْوَابَ رَحْمَتِكَ
Transliteration
Allahumma iftah li abwaba rahmatik.
English Translation
O Allah, open the gates of Your mercy for me.
About this Dua
A supplication recited when entering the mosque, asking Allah for His mercy.
Reference
Hadith • Sahih Muslim 713