Musnad Ahmad 27:338

Waki’ narrated to us, Sufyan narrated to us, from Abu Ishaq, from al-Najrani, from Ibn Umar, that the Prophet, peace and blessings of Allah be upon him, was brought a drunkard, so he struck him with the prescribed punishment. Then he said, "What is your drink?" He said, "Raisins and dates." He said, "Each one of them suffices for the other."