اللَّهُمَّ إِنَّكَ عَفُوٌّ تُحِبُّ الْعَفْوَ فَاعْفُ عَنِّي
Allahumma innaka 'Afuwwun tuhibbul-'afwa fa'fu 'anni
“O Allah, You are the Pardoner, You love to pardon, so pardon me.”
Sunan at-Tirmidhi 3513 — graded Sahih; taught by the Prophet ﷺ for Laylat al-QadrAl-Afuw doesn't just forgive — He erases the sin from your record entirely.