ANSWER: You must not listen to them. This is not their masjid and it is the house of Allah. Whoever comes first is entitled to stand there.

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ANSWER: No need to take ghusl or to do wudhu as this was abrogated. 

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ANSWER: No problem. However, if they are junoob (major sexual impurity), its not permissible to recite the Quran.

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ANSWER: He must pray while sitting down with movements of his eyes if he cannot move at all and even without wudu due to necessity. 

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