Written for the Muslim Who Is Brave Enough To Examine His or Her Own Faith

The Qur’an serves as the theological foundation of Islam, but it offers surprisingly little in terms of legal structure. Out of more than six thousand verses, only around five hundred touch on anything legal, and most of these establish general principles rather than detailed prescriptions. The Qur’an prohibits theft, murder, and adultery, gives broad guidance on fasting and divorce, mentions polygamy under strict conditions, and provides simple inheritance ratios. It emphasizes justice, honesty, compassion, and moral accountability, but it does not supply the vast legal system later known as Sharia. There is no Qur’anic instruction outlining the daily prayer movements, the number of rak‘ahs, or the words to recite. It contains no requirements for hijab or niqab as practiced today, no penalties for apostasy or blasphemy, no stoning punishments, no political structure, no age of marriage, no Sharia court procedures, no detailed divorce or custody arrangements, and no fully developed doctrine of jihad. What many Muslims assume comes from the Qur’an simply is not there. The Qur’an provides the foundation of faith, but not the legal system.

The Hadith, by contrast, form the backbone of Sharia—roughly 75 to 90 percent of the entire structure. These collections, written 150 to 250 years after Muhammad’s death, supply the details that shape virtually every aspect of Islamic practice. They determine how Muslims pray, how zakat is calculated, how the pilgrimage is performed, and how marriages and divorces proceed. They define gender roles, clothing expectations, food regulations, and family structure. They introduce the permissibility of child marriage and outline rules regarding women’s testimony and inheritance. They authorize criminal punishments such as flogging, stoning, amputation, and beheading, and they establish penalties for apostasy (“kill the one who leaves Islam”) and blasphemy. They develop the concept of jihad far beyond the Qur’an’s situational wartime verses, turning it into a comprehensive doctrine of warfare and conquest. Hadith determine leadership qualifications, courtroom procedures, everyday etiquette, and countless social norms. Without the Hadith, nearly all recognizable features of Islamic law and ritual life simply disappear. And yet these texts—forming the bulk of Sharia—were produced generations after Muhammad, not during his lifetime.

A smaller yet still significant part of Sharia comes from ijma, or scholarly consensus, usually defined as the agreement of medieval jurists between the ninth and twelfth centuries. This consensus does not reflect the opinions of ordinary Muslims, nor does it include modern reinterpretations. Instead, ijma frequently reinforced the strictest hadith-based rulings and locked them into permanent law. Consensus supported the death penalty for apostasy, stoning for adultery, Muhammad’s sinlessness, the binding authority of hadith-classification methods, and other doctrines that shaped classical Sharia. Though comprising only a few percent of the legal system, ijma played a crucial role in solidifying the harshest interpretations and making them enduring.
The smallest portion of Sharia, perhaps one or two percent, comes from qiyas, or analogical reasoning. Qiyas functions somewhat like case law, allowing jurists to extend existing rules to new situations. Because wine is forbidden in the Qur’an, qiyas forbids all intoxicants; because theft is prohibited, qiyas extends that to fraud and embezzlement; because certain punishments appear in the Hadith, qiyas expands them to similar offenses. Qiyas does not create new doctrine; it simply stretches existing Qur’anic and hadith-based rules into additional scenarios.

When scholars summarize the sources of Sharia, the pattern is consistent across schools of Islamic law: the Qur’an provides the broad principles (8–12 percent), the Hadith supply the detailed legal framework (75–90 percent), ijma reinforces medieval interpretations (3–5 percent), and qiyas extends those interpretations into new circumstances (1–2 percent). While percentages may vary slightly, the reality does not: the Hadith, not the Qur’an, form the true infrastructure of Islamic law. The Qur’an lays the foundation, but the Hadith build the structure.

This realization often brings a profound shift in perspective. Many Muslims believe Sharia derives directly from the Qur’an. But historically, nearly all of Islamic law arises from human-written hadith collections compiled long after Muhammad’s death. Without those later texts, Sharia would barely exist. Islam as practiced today is not simply the Qur’an expressed in daily life; it is a vast legal and cultural system shaped primarily by the words of men who lived generations after Muhammad, interpreting and codifying thousands of oral reports into binding religious law. Once this becomes clear, the importance of evaluating the Hadith is unmistakable.

NOTE: Footnotes included in book. See book for references.