Is it necessary to wash all clothes that have been defiled by urine upon repentance and returning to prayer, or is it permissible to pray in them?

Prayer is a great pillar of Islam, and abandoning it carries a severe warning. Missed prayers must be made up in order, according to the majority of scholars. If the number of missed prayers is unknown, one should continue making them up until it is highly probable that one has fulfilled their obligation. As for clothing, the impure part must be washed. If the impure part is unknown, the entire garment should be washed. Doubt about impurity does not necessitate washing, based on the principle that the original state is purity.