This is the complete Hadith

`A'ishah (radhiallahu `anha) reported that she asked Allah's Messenger (sallallahu `alayhi wa sallam), "O Messenger of Allah! If I knew which night is Laylat ul-Qadr, what should I say during it?" And he instructed her to say:

"Allahumma innaka `afuwwun tuhibbul `afwa fa`fu `annee - O Allah! You are forgiving, and you love forgiveness. So forgive me." [Recorded by Ahmad, Ibn Majah, and at-Tirmithi. Verified to be authentic by Al-Albani]