Sayyed Mohammad Al-Musawi, Sayyed Mohammad al-Musawi is originally from Iraq and heads up the World Ahlul Bayt Islamic League in London. Other than being involved in various humanitarian projects, he frequently responds to... Answered 10 months ago

If you performed your obligatory prayers with cloth which you thought it Tahir, then discovered later on that it was not Tahir, you do not need to re perform those prayers, but wear Tahir clothes for coming prayers.