What is the ruling regarding someone who swore not to eat food until her friend ate, then her friend -falsely- informed her that she had eaten, so the swearer ate based on that? And is an expiation for a broken oath (kaffarat yamin) required of her?
This is a binding oath (yamin mun'aqidah), and your act of eating necessitates breaking it (hanth). Your colleague's lie does not intercede for you. Therefore, you must hasten to fulfill the expiation (kaffarah), which is one of four matters.
Summarized from the full answer at Ftawy · reviewed Sep 2, 2026
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