Ruling on the prayer of one who forgets the opening takbeer (takbeerat al-ihraam)

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Raising the hands in qunoot
The ahaadeeth of Anas about Qunoot in Fajr

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Should one who joined the prayer late repeat the prostration of forgetfulness if he did it with the imam?
If the imam says the salaam and the person praying behind him has not finished the tashahhud, what should he do?
Where does the row begin?
Raising the hands in qunoot
The ahaadeeth of Anas about Qunoot in Fajr

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