Skip to content
Wellsprings
islamic-usulWe're still mapping where this idea was first discussed. Key passages and related ideas below.

ʿIlla (Effective Cause)

The ratio legis—the underlying effective cause of a ruling—whose identification governs the extension of analogy.

The ratio legis—the underlying effective cause of a ruling—whose identification governs the extension of analogy.

Key passages(16)

Usul 1986explains

Usul · al-Sarakhsi

Very high

Mustasfa · al-Ghazali

Very high

Shifa Mantiq · Ibn Sina

Very high

Rawdat Nazir · Ibn Qudama

Very high

Musawwada Fi Usul Fiqh · Ibn Taymiyya

High

Lumac Fi Usul Fiqh · Abu Ishaq al-Shirazi

High

Mabadi Wusul · al-'Allama al-Hilli

High

Shifa Ghalil · al-Ghazali

High

Furuq · al-Qarafi

High

Mahsul · Fakhr al-Din al-Razi

High

Nafais Usul · al-Qarafi

High

Muhit Bi Taklif · al-Qadi Abd al-Jabbar

High

Daw Bahir · Ibn Qudama

Moderate

Tamhid Awail · al-Baqillani

Moderate

Mabsut · al-Sarakhsi

Moderate

Mabsut · Shaykh al-Tusi

Moderate