2:219 They ask thee concerning wine and gambling. Say: "In them is great sin and some profit for men; but the sin is greater than the profit." They ask thee how much they are to spend; say: "What is beyond your needs." Thus doth Allah make clear to you His Signs: in order that ye may consider.
Help your brother when he is the oppressor by stopping him from oppressing. (Bukhari & Tirmizi)