Du'a on completing the Qur'an: O Allah, I ask You for the best of requests

اللَّهُمَّ إِنِّي أَسْأَلُكَ خَيْرَ الْمَسْأَلَةِ وَخَيْرَ الدُّعَاءِ وَخَيْرَ النَّجَاحِ وَخَيْرَ الْعِلْمِ وَخَيْرَ الْعَمَلِ وَخَيْرَ الثَّوَابِ وَخَيْرَ الْحَيَاةِ وَخَيْرَ الْمَمَاتِ وَثَبِّتْنِي وَثَقِّلْ مَوَازِينِي وَحَقِّقْ إِيمَانِي وَارْفَعْ دَرَجَتِي وَتَقَبَّلْ صَلَاتِي وَاغْفِرْ خَطِيئَاتِي وَأَسْأَلُكَ الْعُلَا مِنَ الْجَنَّةِ

Allahumma inni as'aluka khayral-mas'alati wa khayrad-du'a'i wa khayran-najahi wa khayral-'ilmi wa khayral-'amali wa khayrath-thawabi wa khayral-hayati wa khayral-mamat, wa thabbitni wa thaqqil mawazini wa haqqiq imani warfa' darajati wa taqabbal salati waghfir khati'ati, wa as'alukal-'ula minal-jannah

O Allah, I ask You for the best of requests, the best of supplications, the best of success, the best of knowledge, the best of deeds, the best of rewards, the best of life, and the best of death. And make me firm, make my scales heavy, actualise my faith, raise my ranks, accept my prayers, and forgive my sins, and I ask You for the highest levels of Paradise.

Adapted from al-Mustadrak of al-Ḥākim 1911, which reads "اللَّهُمَّ إِنِّي أَسْأَلُكَ خَيْرَ الْمَسْأَلَةِ، وَخَيْرَ الدُّعَاءِ، وَخَيْرَ النَّجَاحِ، وَخَيْرَ الْعَمَلِ، وَخَيْرَ الثَّوَابِ، وَخَيْرَ الْحَيَاةِ، وَخَيْرَ الْمَمَاتِ، وَثَبِّتْنِي، وَثَقِّلْ مَوَازِينِي، وَحَقِّقْ إِيمَانِي، وَارْفَعْ دَرَجَاتِي، وَتَقَبَّلْ صَلاَتِي، وَاغْفِرْ خَطِيئَتِي، وَأَسْأَلُكَ الدَّرَجَاتِ الْعُلَى مِنَ الْجَنَّةِ" (the same supplication without "the best of knowledge"). This version adds "the best of knowledge" and differs slightly at the end.