Contracts and Transactions in the Shafi'i School

Al-Ghazali's treatment of mu'amalat (civil and commercial transactions) in Al-Wajiz reflects the Shafi'i school's careful integration of prophetic guidance with systematic legal reasoning. The chapter covers the law of sales, leases, partnerships, and the prohibition of riba, all of which bear directly on the daily economic lives of Muslims.

The foundational transaction in Islamic commercial law is the contract of sale (bay'). For a sale to be valid in the Shafi'i school, several conditions must be met: both parties must have legal capacity (they must be sane and, in most cases, adult); the subject matter must exist at the time of the contract; it must be owned by the seller; it must be deliverable; and the price and the goods must be precisely known to both parties, eliminating excessive uncertainty (gharar). Al-Ghazali presents these conditions in Al-Wajiz as the standard Shafi'i framework, derived from the prophetic prohibition of transactions involving gharar and the general Quranic injunction to fulfill contracts (5:1).

Riba — the prohibition of unlawful increase — is one of the most important constraints on commercial transactions in Islamic law. The Shafi'i school, following the hadith of the six ribawi commodities (gold, silver, wheat, barley, dates, and salt), holds that the exchange of equal-type goods from among these six must be done in equal quantity and immediate mutual delivery. Any excess or delay renders the transaction riba. In modern applications, this framework governs discussions of currency exchange, bank interest, and commodity contracts.

The contract of salam (forward sale) is an exception to the general rule that the subject matter must exist at the time of the contract. In salam, a buyer pays the full price in advance for goods to be delivered at a future date. The Shafi'i school permits salam under strict conditions: the full price must be paid at the time of the contract, the goods must be precisely specified in all qualities that affect price, and the delivery date must be fixed. Al-Ghazali details these conditions in Al-Wajiz.

The ijara (lease) contract is addressed as a major category of permitted transactions. The Shafi'i school holds that a lease is a sale of the benefit (manfa'ah) of an asset or person for a period of time or for a specified task, with all conditions of a valid sale applying mutatis mutandis. The subject of the lease must be lawful, precisely described, and the period or task must be specified. Leases of homes, agricultural land, animals for transport, and the services of craftsmen are all addressed in Al-Wajiz.

With respect to marriage (nikah), the Shafi'i school requires the presence of a wali (guardian) for the validity of the marriage contract — a condition not universally accepted by all schools. A woman cannot marry herself without the consent and presence of her guardian, and a guardian cannot compel a woman to marry against her will. The mahr (dower) is an obligatory gift from the husband to the wife that becomes her exclusive property; the Shafi'i school holds that while there is no minimum amount specified, the mahr must have value.

Al-Ghazali's sections on mu'amalat in Al-Wajiz are distinguished by their comprehensiveness and their grounding in evidence. He addresses not only the classical categories of sales and leases but also the more complex areas of partnership (sharikah), agency (wakalah), and pledges (rahn), giving students and practitioners a reliable Shafi'i guide to Islamic commercial and family law.

The enduring importance of Al-Wajiz in the Shafi'i tradition stems from precisely this quality: al-Ghazali's ability to compress the school's positions without distorting them, and to present the law with a clarity and confidence that has served generations of students from Baghdad to Cairo to Hadhramaut to Southeast Asia.