Du'a on completing the Qur'an: O Allah, rectify for me my religion

اللَّهُمَّ أَصْلِحْ لِي دِينِي الَّذِي هُوَ عِصْمَةُ أَمْرِي، وَأَصْلِحْ لِي دُنْيَايَ الَّتِي فِيهَا مَعَاشِي، وَأَصْلِحْ لِي آخِرَتِي الَّتِي فِيهَا مَعَادِي، وَاجْعَلِ الْحَيَاةَ زِيَادَةً لِي فِي كُلِّ خَيْرٍ، وَاجْعَلِ الْمَوْتَ رَاحَةً لِي مِنْ كُلِّ شَرٍّ

Allahumma ashlih li diniyal-ladhi huwa 'ismatu amri, wa ashlih li dunyayal-lati fiha ma'ashi, wa ashlih li akhiratiyal-lati fiha ma'adi, waj'alil-hayata ziyadatan li fi kulli khayr, waj'alil-mawta rahatan li min kulli sharr

O Allah, rectify for me my religion which is the safeguard of my affairs, and rectify for me the affairs of this world wherein is my sustenance, and rectify for me my Hereafter to which is my return, and make life for me an increase for every good, and make death a relief for me from every evil.

Ṣaḥīḥ Muslim 2720