Aisha asked Allah's Messenger (peace be upon him) to tell her what prayers to say on Laylat al-Qadr if she knew which night it was, and he told her to say,

"O Allah, Thou art forgiving and lovest forgiveness, so forgive me."

"Allah huma innaka affowan tohibal aff wa faa fo annaye"

Ahmad, Ibn Majah and Tirmidhi transmitted it, and Tirmidhi declared it to be sound.

Al-Tirmidhi Hadith

Hadith 2091

Narrated by Aisha RA