Musnad Ahmad 788:96

Yahya narrated to us, Ubaydullah informed us, Nafi’ informed me; and Muhammad ibn Ubayd narrated to us, Ubaydullah narrated to us, Nafi’ narrated to me, from Sa’id ibn Abi Hind, from Abu Musa, from the Prophet (peace and blessings of Allah be upon him), who said: "Whoever plays with dice has disobeyed Allah and His Messenger."