What is the ruling on praying in a garment that has urine on it?

Question:
He says: I always find traces of urine in my underwear, and I make every effort to empty my bladder when urinating. Is it permissible for me to lead people in prayer if I am reciting from the Book of Allah?

Answer:
If you are certain that it is urine, that you are certain it is urine, it is obligatory for you to wash it, and it is not permissible for you to pray in underwear or a garment that has impurity in it. It is obligatory for you to wash it, and it is not permissible. This is not a matter of leading the prayer only; the matter is the validity of your own prayer. You are valid, and you are wearing impurity, so if you are certain that it is urine, you must wash it, purify it, or replace it with a pure garment for prayer, whether you are the imam or a follower. However, if the matter is merely doubt, with no certainty but only doubt, then the default is purity, and praise be to Allah. Yes.