​Islamic customs and practices
The fact that the Qur'an and the traditions of the Prophet Muhammad are the sources of Islam's fundamental ideas and values is one of the religion's defining characteristics. The revelation of the Qur'an, which includes legal concepts and injunctions dealing with themes such as ritual, marriage, divorce, succession, commercial transactions, and criminal laws, marks the beginning of the history of Islamic law. In contrast, the sayings, actions, and unspoken approbation of the prophet Muhammad are recorded in the Traditions of the Prophet Muhammad. The legal verses in the Qur'an cover a narrower scope of issues than the literature of the Traditions of the Prophet Muhammad, which contains information on a far greater variety of subjects.
Muslims believe that Islam, in contrast to other legal systems, begins with an established or self-evident basis, which they refer to as the revelation. The establishment of a legal code known as the Shari'ah was an endeavor that was undertaken by Islam with the intention of directing and guiding humanity toward the realization of its moral potential and its value in the world.
According to the beliefs of Muslims, Shariah is the clear way for believers to follow in order to get direction in this world and deliverance in the next. Muslims believe that Shariah refers to the orders, prohibitions, advice, and principles that are outlined in Islam.

The Shariah offers direction in matters of faith, moral behavior, and the practical application of decisions or laws.  In its most fundamental form, an entire way of life is founded not only on the dictates of the law, but also on principles of morality and proper behavior. Some specialized contracts, such as the one requiring amanah (honesty) in murabahah (mark-up) funding, have moral principles written into them as mandatory legal provisions. Other aspects of moral values that belong to business transactions include the following: (a) promptness in the payment of a debt or delivery of an asset; the violation of this feature may result in legal repercussions.
(b) tolerance in terms of bargaining, in which the parties are encouraged to be mindful of each other's requirements and circumstances in order to reach an agreement.
(c) the ability for both parties to terminate the agreement without penalty in the event that one of them is unhappy with the results of the business deal
(d) the upholding of integrity, or amanah, in each and every statement, representation, and warranty.
These guiding principles are not intended to be all-encompassing; rather, they are meant to emphasize the areas in which morality is crucial in business operations.