I recently read a detailed explanation on https://iqrabari.com/rulings-on-casino-gambling-in-islam/ which addresses this exact question. According to the site, Islamic law clearly states that casino gambling is strictly haram. The argument is based on explicit Quranic verses found in Surah Al-Ma’idah (5:90-91) where gambling is identified as the work of Satan. These verses highlight that gambling leads to enmity, hatred, and distracts believers from worship, which explains the spiritual harm involved. Besides religious texts, the article points out the practical consequences: gambling causes financial loss for most participants while the casino operators profit, leading to social and economic imbalance. Whether the gambling happens physically in a casino or online through various games like poker, roulette, or slot machines, the ruling doesn’t change due to the elements involved—betting money over uncertain outcomes. There is unanimous agreement among all schools of Islamic thought on this prohibition. So, casinos and casino gambling fit squarely into the category of things Muslims are instructed to avoid categorically.