ENOfficial
Abu Musa al-Ash'ari reported that the Messenger of Allah, may Allah bless him and grant him peace, said, "Anyone who plays backgammon has rebelled against Allah and His Messenger."
Source: sunnah.com
Other translations
Arabic
حَدَّثَنَا إِسْمَاعِيلُ قَالَ: حَدَّثَنِي مَالِكٌ، عَنْ مُوسَى بْنِ مَيْسَرَةَ، عَنْ سَعِيدِ بْنِ أَبِي هِنْدَ، عَنْ أَبِي مُوسَى الأَشْعَرِيِّ، أَنَّ رَسُولَ اللهِ صلى الله عليه وسلم قَالَ: مَنْ لَعِبَ بِالنَّرْدِ فَقَدْ عَصَى اللَّهَ وَرَسُولَهُ.
sunnah.com