Inheritance in Islamic Law (Ilm al-Faraid)

The Science of Faraid

Ilm al-Faraid — the science of inheritance shares — is considered one of the most important branches of Islamic jurisprudence. The Prophet Muhammad (PBUH) described it as "half of all knowledge" and urged Muslims to learn and teach it. This emphasis reflects the central role that just wealth distribution plays in Islamic social ethics. The Quran devotes more legislative verses to inheritance than to almost any other civil matter, specifying precise fractional shares for numerous categories of heirs.

Quranic Foundation

The primary inheritance verses appear in Surah an-Nisa (4:11–12 and 4:176). These verses allocate specific fractions to daughters, wives, husbands, parents, and siblings, and conclude with the reminder that these are "limits set by Allah" — transgressing them incurs punishment. The pre-Islamic Arab practice of restricting inheritance to adult male warriors is decisively overturned; women, children, and elderly parents all receive guaranteed shares regardless of their ability to contribute economically.

The Six Fixed Shares (Fara'id)

Six fractions appear explicitly in the Quran: one-half (1/2), one-quarter (1/4), one-eighth (1/8), two-thirds (2/3), one-third (1/3), and one-sixth (1/6). A daughter receives half when she is the sole female heir with no brothers; two or more daughters together receive two-thirds. A wife receives one-quarter if there are no children, one-eighth if there are children. A husband receives half if his wife had no children, one-quarter if she did. Parents each receive one-sixth when the deceased has children. These fractions interact with one another and with the presence of various heirs in complex ways that scholars have mapped with mathematical precision.

Asabah: Residual Heirs

After the fixed-share heirs (ashab al-fara'id) have received their portions, what remains passes to the residual heirs (asabah) — primarily agnatic male relatives in descending order of closeness: sons, then grandsons, then fathers, then brothers, and so on. In the absence of any asabah, the surplus returns (radd) to the fixed-share heirs proportionally, or passes to the public treasury (bayt al-mal). This system ensures that wealth does not accumulate outside the family unnecessarily.

The Principle of Hajb (Exclusion)

Closer relatives exclude more distant ones. A full brother is excluded when a son or father is present. A son excludes grandsons. This principle of hajb (blocking) structures the entire inheritance hierarchy and prevents complex distributions from becoming unmanageable. Scholars have developed detailed tables mapping which heirs block which others under every conceivable combination of survivors.

Non-Muslims and Inheritance

All four madhabs agree that a non-Muslim does not inherit from a Muslim, nor does a Muslim inherit from a non-Muslim, based on explicit hadith. A person who kills a relative is also excluded from inheriting from that person (la yathu al-qatil) — a rule that prevents murder for inheritance. Apostasy is treated similarly in the classical books, though some contemporary scholars apply this rule only where it does not conflict with principles of justice in the country of residence.

Hikmah: The Wisdom of Faraid

The faraid system embeds a wealth-redistribution mechanism into every death. Rather than permitting concentration of estates in a single heir's hands — as primogeniture systems historically did — Islamic inheritance spreads wealth across multiple relatives in each generation. Scholars of Islamic economics have noted that this structure, if observed over centuries, functions as a natural brake on extreme wealth concentration. The system also guarantees that close female relatives — daughters, wives, mothers, sisters — can never be entirely disinherited, a revolutionary guarantee in seventh-century Arabia and still a meaningful protection in many parts of the world today.