The hadeeth is referring to where the tribulations would come and exist in Islam. Najd means a high place. For the people of Madinah, their Najd is Iraq. Throughout history and till date, this is where all tribulations come from.

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If she sees the flow of the blood, she must stop until the total days of bleeding exceeds 15 days. Once this happens, she takes ghusul and prays and fasts and consider it to be istihada until the regular time of her menses.

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