Musnad Ahmad 788:165

Makki ibn Ibrahim narrated to us, al-Ja'id narrated to us, from Yazid ibn Khusayfah, from Humayd ibn Bashir ibn al-Muharrar, from Muhammad ibn Ka'b, from Abu Musa al-Ash'ari, that he heard the Messenger of Allah (may Allah bless him and grant him peace) saying: "No one shall flip its dice (knucklebones), waiting for what they will bring, except that he has disobeyed Allah and His Messenger."