What Is Qiyas in Islam? Definition, Pillars, and Types

When new situations arise that the Quran and Sunnah did not address explicitly, Islamic scholarship cannot remain silent. Qiyas in Islam is the established juristic tool that allows qualified scholars to derive rulings for new cases by connecting them to existing ones through a shared underlying cause.

This guide covers the complete qiyas definition, its four pillars, its types, its Quranic and prophetic evidence, and real scholarly examples — drawn entirely from verified Sunni sources including Islamweb, the Egyptian Ministry of Awqaf, and Al-Aluka.

Qiyas in Islam – Linguistic and Legal Definition

The word qiyas carries two related meanings in Arabic: measurement and equality. Ibn Manzur in Lisan al-Arab explains that qiyas refers to determining the measure of one thing by comparing it to another. It is also used to mean equating two things — whether tangibly or conceptually.

In Islamic legal terminology, the qiyas definition established by the usul scholars is more precise. The Shafi’i scholars and leading investigators defined it as: “Extending a known ruling to another known ruling in affirming or negating a judgment through a unifying element shared between them in ruling or attribute.”

The Egyptian Ministry of Awqaf platform defines qiyas concisely: “Establishing a ruling for a branch case that has no explicit text, based on the ruling of an original case that does have an explicit text, because both share the same underlying cause.”

The simplest and most comprehensive qiyas definition in Islamic jurisprudence is therefore: attaching an unaddressed matter to an addressed matter in the same ruling because they share the same cause. This sharing of cause is what distinguishes valid qiyas from mere personal opinion.

Read also: What Is Ijtihad in Islam?

The Quranic and Prophetic Evidence for Qiyas Islamic Jurisprudence

Qiyas in Islam is not a later scholarly invention — it has direct textual support from the Quran and from prophetic practice. Scholars across all four Sunni schools have cited the following evidences:

From the Quran, Allah commands those with insight to draw lessons from observable realities:

“فَاعْتَبِرُوا يَا أُولِي الْأَبْصَارِ” 

Fa’tabiru ya uli al-absar. 

“So take warning, O people of vision.” 

Surah Al-Hashr: 2

Scholars explain that the word i’tibar — from the root meaning to cross over — carries the same meaning as qiyas: crossing from the ruling of the established case to the ruling of the new case. This makes the verse a direct Quranic authorization for analogical reasoning.

Allah also commands referring disputed matters to qualified reasoners:

“وَلَوْ رَدُّوهُ إِلَى الرَّسُولِ وَإِلَىٰ أُولِي الْأَمْرِ مِنْهُمْ لَعَلِمَهُ الَّذِينَ يَسْتَنبِطُونَهُ مِنْهُمْ” 

Wa law radduhu ila al-Rasuli wa ila uli al-amri minhum la’alimahu alladhina yastanbitunahu minhum. 

“if they had referred it back to the Messenger or to those of authority among them, then the ones who [can] draw correct conclusions from it would have known about it.” 

Surah Al-Nisa: 83

The word yastanbitun — to draw out — refers precisely to the scholarly work of deriving rulings from evidences, which includes qiyas.

From the Sunnah, the Prophet himself practiced and approved analogical reasoning. When a man asked whether he could fast on behalf of his deceased mother, the Prophet responded:

“أُمِّي مَاتَتْ، وَعَلَيْهَا صَوْمُ شَهْرٍ، أَفَأَقْضِيهِ عَنْهَا قَالَ ‏”‏ نَعَمْ ـ قَالَ ـ فَدَيْنُ اللَّهِ أَحَقُّ أَنْ يُقْضَى” 

“My mother died and she ought to have fasted one month (for her missed Ramadan). Shall I fast on her behalf?” The Prophet (ﷺ) replied in the affirmative and said, “Allah’s debts have more right to be paid.” 

Sahih Al-Bukhari: 1953

This is an explicit prophetic example of qiyas — the Prophet connected the obligation of fasting to the obligation of repaying a debt, linking them through a shared cause. The companions also practiced qiyas consistently. 

Ali ibn Abi Talib recommended eighty lashes for the one who drinks wine by reasoning that intoxication leads to false speech, which connects it to the punishment for slander — a direct example of companion-level qiyas preserved in historical sources.

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Read also: What Is Kafir in Islam?

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The Four Pillars of Qiyas in Islam

Qiyas in Islam cannot be performed without all four of its pillars being present and correctly identified. If any pillar is missing or invalid, the qiyas itself is invalid. Scholars across all schools agree on these four:

Pillar	Arabic Term	Definition
Original Case	Al-Asl / Al-Maqis ‘alayh	The case whose ruling is established by Quran, Sunnah, or ijma
New Case	Al-Far’ / Al-Maqis	The new case with no explicit ruling, which is being connected to the original
Ruling of the Original	Hukm al-Asl	The specific Sharia ruling that applies to the original case
Shared Cause	Al-‘Illa	The common attribute or reason present in both cases that justifies giving them the same ruling

The most cited example used by scholars to illustrate all four pillars is the qiyas of intoxicants on wine:

• Original case: wine, whose prohibition is established explicitly in Surah Al-Ma’idah verse 90.
• New case: all other intoxicating substances not mentioned in the Quran.
• Ruling of the original: prohibition.
• Shared cause: intoxication — the ability to remove the faculty of reason.

Because every intoxicating substance shares the cause of intoxication with wine, it receives the same ruling of prohibition through valid qiyas.

Read also: What Is Ijtihad in Islam? Definition and Complete Guide

The Types of Qiyas in Islamic Jurisprudence

Qiyas Islamic jurisprudence recognizes several established types, classified according to different criteria. The main classifications used by classical scholars are:

By the strength of the cause in the new case compared to the original:

• Qiyas al-Awla — the cause is stronger in the new case than in the original, making the ruling even more obvious. Example: prohibiting physical abuse of parents is derived by qiyas from the Quranic prohibition of saying “uff” to them. Beating is clearly more harmful than a sound, so the ruling of prohibition applies with greater force.
• Qiyas al-Musawi — the cause is equal in both cases. Example: prohibiting burning the wealth of an orphan is derived by qiyas from the Quranic prohibition of consuming it. The cause — destroying the orphan’s wealth unjustly — is equally present in both actions.
• Qiyas al-Adna — the cause is weaker in the new case than in the original. Example: qiyas of nabidh on wine in prohibition, where the intoxicating effect may be considered less pronounced. This type is the most debated among scholars.

By clarity of the shared cause:

• Qiyas al-Jali (clear qiyas) — the shared cause is evident and undisputed, such as qiyas of striking parents on saying “uff.” All scholars recognize the cause immediately.
• Qiyas al-Khafi (hidden qiyas) — the shared cause is less obvious and requires scholarly investigation, making this type subject to scholarly disagreement in individual cases.

By the direction of the ruling:

• Qiyas al-Tard — the ruling follows the presence of the cause wherever it exists.
• Qiyas al-Aks (inverse qiyas) — the opposite ruling applies when the cause is absent. The Prophet used this when he said: “If placing it in something forbidden earns a sin, then placing it in something permitted earns a reward.”

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The Scholarly Position on Qiyas and Who Rejected It

The vast majority of Islamic scholars across all generations accepted qiyas in Islam as a valid and binding fourth source of Islamic law. Abu Bakr Al-Jassas, a major Hanafi jurist, stated: “There is no disagreement among the first generation, the successors, and those who followed them regarding the permissibility of ijtihad and qiyas on analogous matters.”

The minority positions that rejected qiyas include:

• Ibrahim ibn Sayyar al-Nazzam and some Mu’tazila scholars rejected it as a legal method.
• Dawud al-Zahiri and the Zahiri school rejected qiyas, insisting on adherence only to explicit texts.
• Twelver Shia scholars reject qiyas in Islamic jurisprudence as legally invalid, though they accept it as rationally possible.

The Sunni scholarly consensus — including Hanafi, Maliki, Shafi’i, and Hanbali scholars — is that qiyas is the fourth authoritative source of Islamic law, ranked after the Quran, Sunnah, and ijma. No text exists that prohibits it. All four founding imams practiced and taught qiyas as an essential tool of Islamic legal reasoning.

The Condition That Makes Qiyas Invalid

The most critical rule in all of qiyas Islamic jurisprudence is simple: qiyas cannot be performed where an explicit text already exists. The Egyptian Ministry of Awqaf scholars state explicitly that qiyas is used only when no text from Quran, Sunnah, or ijma addresses the matter.

Islamweb similarly clarifies: “Qiyas is the fourth foundational source, and it is used only when there is no text — there is no qiyas where a text exists.”

Performing qiyas to contradict a clear Quranic verse or authentic hadith is not jurisprudence — it is deviation. This boundary is what separates legitimate scholarly qiyas from personal whim, and it is the reason scholars required that the mujtahid master both the Quran and Sunnah before exercising any analogical reasoning.

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Conclusion

Qiyas in Islam is a precisely defined, evidence-based scholarly tool that allows Islamic law to address every new circumstance without departing from its revealed foundations. Its qiyas definition, four pillars, and types have been taught and practiced by the greatest scholars of Ahl al-Sunnah across fourteen centuries. Understanding it is essential for every Muslim who wants to comprehend how Islamic rulings are correctly derived and applied.

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