Maliks Muwatta Book 42, Hadith Number 2.

Yahya related to me from Malik from Thawr ibn Zayd ad-Dili that Umar ibn al-Khattab asked advice about a man drinking wine. Ali ibn Abi Talib said to him, “We think that you flog him for it with eighty lashes. Because when he drinks, he becomes intoxicated, and when he becomes intoxicated, he talks confusedly, and when he talks confusedly, he lies.” (80 lashes is the same amount as for slandering) Umar gave eighty lashes for drinking wine.