Aisha RA asked: 'O Messenger of Allah, if know what night is the night of Qadr, what should I say during it?'
He said: 'Say:
اللَّهُمَّ إِنَّك َ عَفُو ، تُحِبُّ الْعَفُوَ فَاعْفُ عَنِّي
Allahumma innaka afuwwun tuhibbul afwa fa'fu annee
O Allah, You are most forgiving and love forgiveness, so forgive me.