Whoever voluntarily swallows food remnants that are caught between his teeth, or swallows some of the water he uses to rinse out his mouth whilst doing wudoo’, has broken the fast

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Check below answers in case you are looking for other related questions:
She used to do the “secret habit” when fasting, out of ignorance
The muezzin gave the adhaan seven minutes before the proper time and they broke their fast

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Related Answers:
Do major sins invalidate the fast?
The blood that comes out from between the teeth does not invalidate his fast
It is permissible to cook whilst fasting
She used to do the “secret habit” when fasting, out of ignorance
The muezzin gave the adhaan seven minutes before the proper time and they broke their fast

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