What is the ruling on one who prayed while having some impurities stuck in the urinary tract?

If the tissues are free of impurity, then there is no harm in their presence or their attachment to the worshipper. However, if they contain impurity and this is not discovered until after the prayer is completed, then the prayer is valid according to the most preponderant opinion of the scholars, which is the view of the majority. The Malikis, however, recommend repeating the prayer within its prescribed time. If one is ignorant of their state or doubts it, the default assumption is purity. But if one is certain of their impurity and discovers this before or during the prayer, then the prayer is invalid and must be repeated.