Vowed iʿtikāf: a binding specified duration, fasting as a condition, with nights and continuity where days are vowed.
Voluntary iʿtikāf: a non-vowed retreat may be short and, in Hanafi explanation, does not require fasting.
This comparison draws on both the quoted passage and its authoritative Hanafi commentary.
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Bab al-Iʿtikaf: Rules, Restrictions, Invalidation and Vows
Vowed iʿtikāf: a binding specified duration, fasting as a condition, with nights and continuity where days are vowed.
Voluntary iʿtikāf: a non-vowed retreat may be short and, in Hanafi explanation, does not require fasting.
This comparison draws on both the quoted passage and its authoritative Hanafi commentary.