Is physical punishment, performed by a Muslim authority, an obligation upon a Muslim who has sinned?

Fatwa, posted 4.22.2010
Religious Authority: 
Yusuf al-Qaradawi
Fatwa Question or Essay Title: 
Is physical punishment, performed by a Muslim authority, an obligation upon a Muslim who has sinned?

Repentance which will suffice to cleanse a sinner from their sins. So long as the sinner makes a resolution not to return to his old ways, Allah will help him to succeed and prosper. However, the punishment is not an obligation upon him and it is enough for him to conceal himself with the cover offered to him by Allah, so he is not talk to anyone about his sins and remain determined to abide by his repentance and return to Allah.