She thought that she was in nifaas following a miscarriage so she did not fast or pray

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Check below answers in case you are looking for other related questions:
He did not know that ghusl from janaabah is obligatory; should he repeat the prayers?
Is it essential to stop eating and drinking as soon as one hears the adhaan for Fajr?

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Related Answers:
He broke his fast when he was observing a naafil fast in order to accept an invitation to a meal; will he be rewarded for his intention to fast and accepting the invitation?
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He did not know that ghusl from janaabah is obligatory; should he repeat the prayers?
Is it essential to stop eating and drinking as soon as one hears the adhaan for Fajr?

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