Purity: Recommended Dua for the Dying
Practical Laws of Islam as per the teachings of Ayatullah Sistani
Ruling 525:
It is recommended that this duʿāʾ be impressed upon the dying person in a manner that he understands:
اَللّٰهُمَّ ٱغْفِرْ لِيَ الْكَثِيْرَ مِنْ مَعَاصِيْكَ، وَٱقْبَلْ مِنِّيَ الْيَسِيْرَ مِنْ طَاعَتِكَ، يَا مَنْ يَقْبَلُ الْيَسِيْرَ وَيَعْفُوْ عَنِ الْكَثِيْرِ، اِقْبَلْ مِنِّيَ الْيَسِيْرَ وَٱعْفُ عَنِّيَ الْكَثِيْرَ، إِنَّكَ أَنْتَ الْعَفُوُّ الْغَفُوْرُ، اَللّٰهُمَّ ٱرْحَمْنِيْ فَإِنَّكَ رَحِيْمٌ
allāhummagh fir liyal kathīra min maʿāṣīk, waqbal minniyal yasīra min ṭāʿatik, yā man yaqbalul yasīra wa yaʿfū ʿanil kathīr, iqbal minniyal yasīra waʿfu ʿanniyal kathīr, innaka antal ʿafuwwul ghafūr, allāhummar ḥamnī faʾinnaka raḥīm
O Allah! Pardon the many times I have disobeyed You, and accept the few instances when I have obeyed You. O You Who accepts the few and pardons the many! Accept from me what are few and pardon me for the many. Indeed, You are the All-Pardoning, the All-Forgiving. O Allah! Have mercy on me, for You are the Ever-Merciful.
-Ayatullah Sistani, Practical Laws of Islam, Purification (Taharah)