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Fiqh al-Sawm — The Jurisprudence of Fasting: What Breaks It, What Doesn't, and What Completes It

فِقهُ الصَّوم — فِقهُ الصَّوم: مَا يُفسِدُهُ وَمَا لَا يُفسِدُهُ وَمَا يُكمِلُه
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Fiqh al-Sawm (فِقهُ الصَّوم — the jurisprudence of fasting; from *sawm* — fasting, restraint, abstention) is the detailed legal framework governing the validity of the Ramadan fast and other fasts in Islamic law. The foundational principle: *sawm* is not merely abstaining from food and drink but a comprehensive restraint of the self — the Prophet said: *'Whoever does not abandon false speech and acting upon it and ignorance, Allah has no need of him abandoning his food and drink.'* (Bukhari) Legally, the fast is invalidated by things that reach the inside through a normal route and by sexual intercourse; it is not invalidated by what enters through non-eating routes, by forgetfulness, or by swallowing unavoidable quantities. The Quran explicitly establishes the categories of excuse: *'and whoever is ill or on a journey — the same number [of missed days] from other days.'* (2:185)

Things That Invalidate the Fast

Category 1 — Invalidation + Qada’ only (make up later):

Category 2 — Invalidation + Qada’ + Kafara (expiation):

Madhab differences on injections:


Things That Do NOT Invalidate the Fast


Excused from Fasting

Sick person: permitted to break the fast if fasting causes significant harm; must make up the days later.

Traveler: permitted to break the fast on a journey meeting the travel distance requirements.

Pregnant and nursing women: permitted to break if they fear harm to themselves or the child; they make up the days, and according to some scholars also pay fidya (feeding a poor person per day) if they feared for the child alone.

The elderly who cannot fast: pay fidya (feeding a poor person per each missed day) with no qada’.

See also: Fiqh Overview, Fiqh Madhabs, Taharah, Kafara, Sadaqa Al Fitr, Siyam Nafl

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