Any sin, no matter the gravity or how serious it is, or how many, if one repents sincerely before death, Allah forgives it correct? There is not anything you can name that you cannot repent for while alive right? After repenting how should one feel on whether his repentance was accepted by Allah?

Ustadh AbdulAziz al-Haqqan

Say: "O 'Ibadi (My worshippers) who have transgressed against themselves (by committing evil deeds and sins)! Despair not of the Mercy of Allah, verily Allah forgives all sins. Truly, He is Al-Ghafur Al-Raheem All-Forgiving, Most Merciful.