Pronunciation: Rabbana zalamnaaa an-fu-sa-na wa il-lam tag-fir lana wa tar-ham-na la-na-koo-nan-na mi-nal-khasireen.
Meaning: Our Lord ! we have sinned against ourselves and unless You grant us forgiveness and bestow Your mercy upon us, we shall most certainly be lost.
You've sinned? Feel bad for what you did? No problem! Seek the forgiveness of Allah. Verily Allah is the most-forgiving!
Reference: Surah Al-Araf Verse 23