Hazrat Aisha Radiallah Anha stated that I asked Rasool Allah peace be upon him,
"If I find Lailatul Qadar then what should I do?
Allah's Messenger (sallallaahu 'alaihi wasallam) said, recite this Dua.
"ALLAH HUMMA INNAKA A’FUVUN TOHIB BUL AFVA FA’AFU ANNI"
(Tirmidhi)