Manhiyyat (Prohibitions)

Whatever has been prohibited in the Qur?an and the Sunnah is for a good reason. Every Muslim is commanded to learn his or her religion, and being aware of these prohibitions is part of that essential knowledge. The Qur?an and the Sunnah enjoin virtuous behaviour, and any actions they prohibit are destructive deeds that a Muslim should avoid.
In Prohibitions in Islam, Shaykh Muhammad S?lih al-Munajjid explains that Allah Almighty and His Messenger (blessings and peace be upon him) have prohibited everything that contains any sort of harm or evil. These prohibitions vary in their degree of evil: they are either forbidden or detestable, and a practicing Muslim should avoid both kinds.