One remembers that during a raka’a one did not recite al-Fatihah

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The imaam forgot and stood up for a third rak’ah in Salaat al-Taraaweeh,then he sat down
Distraction during salaat (prayer) by shaitan

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Related Answers:
When should the prostration of forgetfulness be done, and what should be said in it?
He was not sure about the number of prostrations, and he omitted the prostration of forgetfulness out of ignorance; what is the ruling on his prayer?
What should a person who joined the prayer late do, if the imam made a mistake and said the tasleem after the third rak‘ah of a four-rak‘ah prayer, then remembered and stood up to do a fourth rak‘ah?
The imaam forgot and stood up for a third rak’ah in Salaat al-Taraaweeh,then he sat down
Distraction during salaat (prayer) by shaitan

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