It was narrated from 'Aishah that she said:
O Messenger of Allah, what do you think I should say in my supplication, if I come upon Laylatul-Qadr? He said: Say: 'Allahumma innaka 'afuwwun tuhibbul-'afwa, fa'fu 'anni (O Allah, You are Forgiving and love forgiveness, so forgive me).'