‘Aishah (May Allah be pleased with her) reported:I asked: “O Messenger of Allah! If I realize Lailat-ul-Qadr (Night of Decree), what should I supplicate in it?” He (ﷺ) replied, “You should supplicate:
اللَّهُمَّ إِنَّكَ عَفُوٌّ تُحِبُّ الْعَفْوَ فَاعْفُ عَنِّي : “O Allah! Verily, You are the Oft–Pardoning, You love to pardon, so pardon me.).”[At-Tirmidhi].