Case one: a person eats while genuinely forgetful, remembers, and immediately stops. The fast remains valid, without qaḍāʾ or kaffārah.
Case two: after forgetful eating, the person believes the fast has already been spoiled and intentionally eats again. In the stated Hanafi ruling, qaḍāʾ becomes due, but not kaffārah. The additional intentional act explains the changed ruling.
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Kitab al-Sawm: Fasting Hours, Invalidators, Qada and Kaffarah
Case one: a person eats while genuinely forgetful, remembers, and immediately stops. The fast remains valid, without qaḍāʾ or kaffārah.
Case two: after forgetful eating, the person believes the fast has already been spoiled and intentionally eats again. In the stated Hanafi ruling, qaḍāʾ becomes due, but not kaffārah. The additional intentional act explains the changed ruling.