Musnad Ahmad 27:382

Rawh narrated to us, Ibn Jurayj narrated to us, Musa ibn Uqbah informed me, from Nafi, from Ibn Umar, that the Messenger of Allah (peace and blessings of Allah be upon him) said: "Every intoxicant is Khamr (wine/intoxicant), and every Khamr is unlawful."