Riyad as-Salihin: The Book of Virtues – Hadith No. 516 — Aishah (May Allah be pleased with her) reported: I asked: “O Messenger of… (Hadith No. 516)

'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: Allahumma innaka 'afuwwun, tuhibbul-'afwa, fa'fu 'anni (O Allah, You are Most Forgiving, and You love forgiveness; so forgive me).".

Explanation:

Reference: Riyad as-Salihin, The Book of Virtues, Hadith No. 516