She was fasting to make up missed days, but she said: I am fasting six days of Shawwaal

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What matter is the intention - even if there is a slip of the tongue
Permissibility of Ambiguity and Definition of Necessity

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Related Answers:
Is this expression correct?
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Is it prescribed to say Bismillah fi awwalihi wa aakhirihi if you did not say Bismillah when beginning an action?
What matter is the intention - even if there is a slip of the tongue
Permissibility of Ambiguity and Definition of Necessity

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