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https://thealbaanisite.com/2014/06/08/when-a-man-comes-to-the-prayer-and-finds-that-the-people-are-in-rukoo-is-he-to-say-two-takbeers-or-just-one/
When a Man Comes to the Prayer and Finds that the People are in Rukoo', is He to Say Two Takbeers or Just One?