اللَّهُمَّ إِنِّي أَسْأَلُكَ بِرَحْمَتِكَ الَّتِي وَسِعَتْ كُلَّ شَيْءٍ، أَنْ تَغْفِرَ لِي

O Allāh, I ask You by Your mercy which envelopes all things, that You forgive me.

Reference: O Allāh, I ask You by Your mercy which envelopes all things, that You forgive me. Ibn Mājah (#1753, 1/557) and al-Hāfiẓ declared it ḥasan in this takhrīj of _al-Athkār_. Also see _Sharḥ al-Athkār_ (4/342).