Dua for the last 10 nights of Ramadan:
اَللَّهُمَّ اِنَّكَ عَفُوٌّ ، تُحِبُّ الْعَفْوَ فَاعْفُ عَنِّي
Aisha (may Allāh be pleased with her) reported: I asked: “O Messenger of Allah! If I realise Laylat-ul-Qadr (Night of Decree), what should I supplicate in it?”
The Prophet (peace and blessings of Allāh be upon him) replied, “You should supplicate: Allahumma innaka ‘afuwwun, tuhibbul-‘afwa, fa’fu ‘anni.
(O Allah, You are Most Forgiving, and You love forgiveness; so forgive me).” [Tirmidhi].