Is practicing boxing and earning money from it—including money from advertisements, fighting, and betting from which one donates—permissible in Islamic law? And does the impermissibility of this money—if it exists—equate to the impermissibility of usury, gambling, and consuming the orphan's property, taking into consideration the personal circumstances of the questioner?

Boxing is forbidden due to the harm and damage it entails. One must repent and cease boxing and earning from it, as well as from betting on it.

Money earned from boxing: If one was ignorant of the prohibition: Some scholars hold that it is permissible to benefit from the money after repentance. If one was aware of the prohibition: The money must be disposed of in charitable ways and for the benefit of Muslims. It is permissible for him to take from it what suffices his needs if he is poor, or to use it as capital for a business that enables him to do without forbidden earnings.

Ruling on money earned from boxing compared to usury, gambling, and consuming the orphan's property: Betting is akin to gambling, which is consuming money unjustly. As for usury and consuming the orphan's property, they are more severely forbidden and are among the gravest sins.