Laylatul Qadr Dua'a

It was narrated from 'Aishah (May God be pleased with her) that she said:

"O Messenger of Allah, what do you think I should say in my supplication, if I come upon the Night of Value ?"
He said: "Say: O Allah, You are Forgiving and love forgiveness, so forgive me.'" (Reported by at-Tirmidhi)

Phonetic:
Allahumma innaka 'afuwwun tuhibbul-'afwa, fa'fu 'anni

Arabic:

اللَّهُمَّ إِنَّكَ عَفُوٌّ تُحِبُّ العَفْوَ فَاعْفُ عَنِّي

So Keep listen Pray it during the last 10 days of Ramadan.