When is it permissible for a person to pray sitting in obligatory prayers?

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Check below answers in case you are looking for other related questions:
What is the “difficulty” which makes it permissible to pray sitting down?
He is not sure whether he said the opening takbeer or not

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What is the “difficulty” which makes it permissible to pray sitting down?
He is not sure whether he said the opening takbeer or not

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