Abu Salih (may Allah have mercy on him) narrates from Sayyiduna Mu'awiyah (may Allah be pleased with him) that the Messenger of Allah (peace and blessings be upon him) said: "When someone drinks wine, flog him," and concerning the fourth time he said: "Then kill him."
Hadith Referenceالمعجم الكبير للطبراني / باب الميم / 16817