It is a sunnah to pray two rakhah between athan  and iqama of Maghreb

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As long as he is a Muslim, you must pray behind him! These are all allegations that were not proven and it is a sin to talk about them without witnessing them or proving them as Allah will question all those who spread such allegations on the Day of Judgement.

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This is permissible but the sunnah is to include the dead in your own sacrifice.

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