Sahih Bukhari
Limits and Punishments set by Allah (Hudood)
Volume: 008 / Book Number: 081 / Hadith Number: 770
Narrated As-Sa'ib bin Yazid:
We used to strike the drunks with our hands, shoes, clothes (by twisting it into the shape of lashes) during the lifetime of the Prophet, Abu Bakr and the early part of 'Umar's caliphate. But during the last period of 'Umar's caliphate, he used to give the drunk forty lashes; and when drunks became mischievous and disobedient, he used to scourge them eighty lashes.