Al-Kāfi

Hadith 372
gambling
9- عِدَّةٌ مِنْ أَصْحَابِنَا عَنْ سَهْلِ بْنِ زِيَادٍ عَنِ الْوَشَّاءِ عَنْ أَبِي الْحَسَنِ (عَلَيْهِ السَّلام) قَالَ سَمِعْتُهُ يَقُولُ الْمَيْسِرُ هُوَ الْقِمَارُ.
9. A number of our people have narrated from Sahl ibn Ziyad from Al-Washsha” who has said the following: “I once heard abu al-Hassan (a.s.), saying, ‘Al-Maysir is gambling.’”
Source: Shaykh Muḥammad b. Yaʿqūb al-Kulaynī