Sharea provisions are based on four resources, two of them are primary (Quran & Sunnah) and the other two are secondary Consensus (Ejma’), and Analogy (Qiyas). 

1. Holy Quran

Scholars identify Holy Quran as follows "It’s the words of Allah revealed to his prophet Mohammad (PBUH), which reading is an act of worship, begins with Surat Al-Fatiha and ends with Surat Al-Nas.

2. Prophetic Narrations (Sunnah)

Sunnah is every act, saying and tacit approval of the prophet Mohammad (PBUH). Sunnah is considered and primary source of legislation due to instructions of Holy Quran. Many Verses commanded Muslims to follow the Prophet (PBUH) guidance such as in Suart Al Hashr, Verse 7: “So take what the Messenger assigns to you, and deny yourselves that which he withholds from you. And fear Allah, for Allah is strict in punishment”

Sunnah is divided into three divisions:

• The Prophet's Sayings.
• The Prophet Acts.
• The Prophet acceptance of others' a sayings or acts.

3. Ejma’ (Consensus)

The consent of Muslim Jurists on a specific issue in a specific time, such as Taraweeh Prayer in a congregation (Jama'a). Although it’s difficult to achieve Ejma’, the modern jurisprudential academies are playing important role in this regard.

4. Qiyas (Analogy)

In modern issues, of non-equivalence in the past, Muslim scholars in such case, seek for a common similarity between the discussed matter and similar matter that its provision in Sharia is known. Shall such a case be found, then, the modern issue gets the same provision. Drugs is a clear example of Qiyas, since it share the same mental effect with alcohol, and since alcohol drinking is strictly forbidden in Saria, then drugs is also forbidden (Haram).

Sharea’ depends on group of principles and regulations to organize the life of individuals in two directions; their relation with god and their relations with others. Fiqh (Jurisprudence) is considered as a part of whole named Sharea’. Fiqh is divided into two main divisions:

• Ibadat meaning worship acts: Addresses Prayer, Fasting, Zakat, Hajj and related Purity.
• Mu'amalat meaning transactions: Addresses financial transactions, personal issues, inheritance and sanctions.

Sharea’ provisions are five: Wajeb (duty), Mustahab (desirable), Mobah (permissible), Makrooh (disgraceful) and Haram (forbidden). 

Muslim jurists studied the Quran Texts and Sunnah and concluded that the main purpose of Islam regulations and Sharea’ Provisions is to protect religion, self, lineage, brain and property. These are called the five assets. 

The Islamic Financial System can be easily understood when understanding Islam point of view toward money and understanding main Taboos of Islamic Financial System.

1 - All types of Usury (designated increase for one party of the contract with no corresponding from the other party).

2 - Gharar (Uncertainty): ambiguity in one or all of the contract terms which leads to conflict. In other words, it’s what cannot be expected or evaluated or properly described.

3 - Selling or purchasing forbidden goods and assets. 

Islam in its primary sources express its unique and original perception of money as:

• It belongs to Allah, and human is a trustee.
• It is a tool to evaluate goods and assets.
• It is an intermediate to exchange goods and assets between people.

Accordingly, money is not a mean to generate profit from itself. The profit can be generated by selling and purchasing goods and assets using money. 

Islamic Financial System recognized the time value for money. This is clear in Credit Sales. Goods can be sold for a specific cash value, and for higher value for credit. Although, paying any amount of money for extending loan repayment period for a due loan is considered as a forbidden usury.