The Quranic Basis of Islamic Inheritance Law

The law of inheritance (fara'id or mirath) occupies a uniquely prominent place in Islamic jurisprudence, distinguished from other areas of Islamic law by the extraordinary specificity with which the Quran addresses it. While most areas of Islamic law are governed by general Quranic principles whose detailed application requires extensive scholarly elaboration through hadith and legal reasoning, the Quran itself provides precise arithmetic fractions — halves, thirds, quarters, sixths, eighths — designating the shares of specific heirs in the deceased's estate. This unusual Quranic specificity reflects the divine wisdom that recognized inheritance as an area of potential injustice and family conflict requiring clear and unambiguous divine guidance.

Muhammad Iqbal Siddiqi's treatment of Islamic will and inheritance begins with this Quranic foundation, examining the three principal inheritance passages in detail. The most comprehensive of these is found in Surah an-Nisa (4:11-12 and 4:176), where Allah specifies: 'Allah instructs you concerning your children: for the male, what is equal to the share of two females. But if there are [only] daughters, two or more, for them is two thirds of one's estate. And if there is only one, for her is half. And for one's parents, to each one of them is a sixth of his estate if he left children. But if he had no children and the parents [alone] inherit from him, then for his mother is one third.'

This passage, with its precise arithmetic designations, illustrates the Quranic approach to inheritance: specific numerical shares are assigned to specific categories of heirs based on the closeness of their relationship to the deceased, their financial needs and obligations, and the overall framework of Islamic family responsibility. The principle underlying the general rule that a male heir receives twice the share of a female heir in the same category — a rule frequently misunderstood by critics — must be understood in the context of the overall Islamic financial responsibility system: the male heir who receives a double share is simultaneously obligated to provide for his wife, children, and other dependents, while the female heir who receives a single share faces no such mandatory financial obligations and may retain her entire inheritance for her personal use.

The three Quranic inheritance passages together establish the shares of six primary heirs: the husband or wife, daughters (in the absence of sons), mothers, fathers, full sisters (in certain situations), and uterine siblings. From these Quranic foundations, the scholars of Islamic jurisprudence have elaborated through hadith and legal reasoning the complete science of Islamic inheritance law — one of the most technically sophisticated branches of Islamic fiqh — addressing the shares of all possible categories of heirs, the rules governing the cases where the total shares of designated heirs would exceed or fall short of the total estate, and the principles for dividing the estate among multiple heirs of the same category.

The Prophet Muhammad (peace be upon him) emphasized the importance of the science of inheritance, calling it 'half of knowledge' in one well-known hadith and predicting that it would be among the first sciences to disappear from the Muslim community. His emphasis reflects the practical importance of correct inheritance distribution: an estate improperly divided creates injustice among the heirs, disturbs family relations, and represents a violation of the divine trust that each heir has been given a specific right to their designated share.

Siddiqi notes that the Islamic inheritance system serves profound social purposes beyond the immediate distribution of a deceased person's estate. By distributing wealth across a broad circle of relatives — including multiple levels of descendants, ascendants, and collateral relatives — the Islamic inheritance system acts as a mechanism for the prevention of excessive wealth concentration, ensuring that each generation's assets are redistributed among a wider family network rather than accumulated in the hands of a single heir.