he furūʿ al-dīn are the platform of Islamic law. This does not mean that they are the entirety of the law. Just because prayer or salāt may be the most important ritual practice of Islamic law, it does not mean that other practices are unimportant. Every aspect of Islam plays a specific role.

Think of it as a bunch of pillars in a building. Every pillar plays a critical role in upholding a building. Yes, some pillars may be bigger than the others, but they are all important in their own way. Here is a small list of other obligatory and forbidden acts in Islam:
Marriage can be wājib: If a person is afraid that by staying single, he or she will fall into sin, then marriage becomes obligatory. Remember that marriage is one of the most important foundations of the Islamic community’s salvation in the Hereafter since it protects them from zina.

Zina is forbidden in Islam. It is one of the major sins (kabā’ir, sing. kabīra). Zina is illicit intercourse in Islam between a man and a woman. Usually zina either takes place between two unmarried people, or takes place as a form of adultery. Zina carries a heavy penalty in Islam as it risks the health of the Muslim ummah by undermining the sanctity of marriage. According to Islam, marriage is the best institution for raising spiritually healthy children. Without marriage, the future of the next generation is put in danger.

Drinking alcohol or taking drugs is haram in Islam. Drinking alcohol is also a kabīra and is punishable in Islam. Alcohol is often the source of many of society’s crimes and family breakdown. But in Islam, alcohol’s worst effect is on a person’s soul, spirit and heart. It is detrimental to a person’s spiritual health for it opens the gates for Shaytān.