Du'a on completing the Qur'an: O Allah, I ask You for that which brings Your mercy

اللَّهُمَّ إِنِّي أَسْأَلُكَ مُوجِبَاتِ رَحْمَتِكَ، وَعَزَائِمَ مَغْفِرَتِكَ، وَالسَّلَامَةَ مِنْ كُلِّ إِثْمٍ، وَالْغَنِيمَةَ مِنْ كُلِّ بِرٍّ، وَالْفَوْزَ بِالْجَنَّةِ، وَالنَّجَاةَ مِنَ النَّارِ

Allahumma inni as'aluka mujibati rahmatika, wa 'aza'ima maghfiratika, was-salamata min kulli ithm, wal-ghanimata min kulli birr, wal-fawza bil-jannah, wan-najata minan-nar

O Allah, I ask You for that which brings Your mercy and the means of Your forgiveness, safety from every sin, the benefit of every good deed, success in attaining Paradise, and deliverance from the Fire.

al-Mustadrak of al-Ḥākim 899