314. Dua recited during Iftar #2
اَللَّهُمَّ إِنِّي أَسْأَلُكَ بِرَحْمَتِكَ الَّتِي وَسِعَتْ كُلَّ شَيْءٍ أَنْ تَغْفِرَ لِي
Allaahumma 'innee 'as'aluka birahmatikal-latee wasi'at kulla shay'in 'an taghfira lee
Translation
O Allah, I ask You by Your mercy, which encompasses all things, that You forgive me.
Abdullah bin Amr (RA) used to say this dua during Iftar.
ReferenceHasan (Hafiz Ibn Hazar). Takhrijul Adhkar, Sharhul Adhkar: 4/342