If you finish before Isha time, you must pray it as soon as you finish. If this is not possible, you must ask for permission to go to the toilet and pray quickly.

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In the case of blowing on water after reciting ruqya on it, this is permissible. But you should not blow on liquid or your food to cool it down, as this is what the Prophet salla Allahu alaihi wa salaam told us.

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