Sahih Muslim
The Book Pertaining to Punishments Prescribed by Islam (Kitab Al-Hudud)
Book Number: 017 / Hadith Number: 4226
Anas b. Malik reported that a person who had drink wine was brought to Allah's Apostle (may peace be upon him). He gave him forty stripes with two lashes. Abu Bakr also did that, but when Umar (assumed the responsibilities) of the Caliphate, he consulted people and Abd al-Rahman said: The mildest punishment (for drinking) is eighty (stripes) and 'Umar their prescribed this punishment.