A man prayed, but his clothes were not in a state of ritual purity, and he does not know when this started. How do you advise him?

Question:
A man prayed, but his clothes were not in a state of ritual purity, and he does not know when this started. How do you advise him? May Allah reward you with good.

Answer:
If a person finds ritual impurity on his clothes, it is obligatory for him to wash it and remove it for the future. As for what has passed, his prayer is valid, especially if he does not know when it occurred, for it may have happened after the prayer, and he is not certain that he prayed in impure clothes, so his prayer is valid. Likewise, if he was certain of the impurity and then forgot it and prayed in it, his prayer is valid according to the stronger position in this issue. So the conclusion is that he removes it for the future, and as for what has passed, his prayer is valid. Yes. May Allah reward you with good, and may He reward you.