Taharah: Purification According to Al-Wajiz

Taharah (ritual purification) is the gateway to Islamic worship. Without it, prayer is invalid, and many other acts of devotion cannot be performed. Al-Ghazali opens Al-Wajiz, as is standard in the Shafi'i tradition, with a thorough treatment of purification, establishing the foundational categories that govern all subsequent legal discussion.

Water is the primary agent of purification in Islamic law. The Shafi'i school divides water into four categories based on its legal status. Mutlaq water — absolute or pure water — is water that remains in its natural state without any admixture that would alter its description, and it is both pure in itself and purifying for others. Examples include rainwater, seawater, well water, and spring water. The Shafi'is explicitly hold that seawater is pure and purifying, citing the famous hadith in which the Prophet (peace be upon him) declared it permissible: 'Its water is pure and its dead creatures are lawful.' This ruling appears in Al-Wajiz among the opening discussions of valid purification agents.

If water has been used to remove ritual impurity (hadath) or filth (najasah), it becomes musta'mal (used water) and may no longer be used for purification in the Shafi'i school, even if its essential qualities — color, taste, and smell — have not changed. This is a distinctive Shafi'i position that differs from the Hanafi school, which generally permits used water for purification provided its essential qualities remain intact. Al-Ghazali presents this ruling clearly in Al-Wajiz as the established Shafi'i position.

Wudu' (minor ablution) is required for prayer, touching the Quran, and circumambulating the Ka'bah. The Shafi'i school holds that wudu' has six obligatory components (fara'id): the intention (niyyah), washing the face, washing the arms to and including the elbows, wiping part of the head, washing the feet to and including the ankles, and maintaining the sequence (tartib) of these acts. The requirement of tartib — performing the acts in the order specified — is a distinctly Shafi'i and Hanbali position not shared by the Hanafi and Maliki schools.

Ghusl (major ritual bath) is required following sexual intercourse, ejaculation, menstruation, postpartum bleeding, and death (performed by others on the deceased). The Shafi'i school requires two obligatory elements for valid ghusl: intention and complete washing of the entire body including the scalp and hair roots. Al-Ghazali presents these obligations clearly, noting the scholarly disagreement about whether flowing water over the entire body is sufficient or whether active rubbing (dalk) is also required — the Maliki school requires rubbing, the Shafi'i school does not.

Tayammum (dry ablution using clean earth) is permitted when water is unavailable or when its use would cause harm to a person who is ill or injured. Al-Ghazali discusses the conditions under which tayammum becomes permissible, the correct method — intention, striking clean earth, wiping the face, then wiping the hands to the wrists — and the circumstances that invalidate it. The Shafi'i position on tayammum is more restrictive than the Hanafi position regarding what surfaces may be used and under what conditions illness justifies substituting dry ablution for water.

The chapter on najasah (ritual impurity) addresses the types of substances that defile objects and persons, and the methods for their removal. The Shafi'i school distinguishes between heavy najasah (mughalladhah) — notably dog saliva and pig derivatives — which require seven washings, one with earth or a similar purifying agent, and light najasah (mukhaffafah) — the urine of male infants who have not yet eaten food — which is removed by sprinkling water. All other impurities fall into the intermediate category removed by washing until the substance is gone.

Al-Ghazali's treatment of taharah in Al-Wajiz reflects his characteristic pedagogical clarity: he states rulings directly, notes the most important disagreements within the school, and occasionally flags differences with other madhabs. The chapter provides students with a reliable map of Shafi'i purification law that serves as the indispensable foundation for everything that follows.