He wakes up a quarter of an hour before sunrise and delays purifying himself because of waswaas; can he do tayammum?

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If a person wakes up junub and fears that the time for prayer may end if he does ghusl, should he do tayammum?
Praying on a plane when one is unable to stand or face the qiblah

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If a person wakes up junub and fears that the time for prayer may end if he does ghusl, should he do tayammum?
Praying on a plane when one is unable to stand or face the qiblah

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