Praying with impurity on one’s clothes that one was unaware of

Question:
He says: Honorable Shaykh, may Allah grant you success. A few days ago, I was sleeping and woke up for the Maghrib prayer, so I prayed it, and then I prayed the 'Isha' prayer. In the middle of the night, I discovered that there was impurity on my underwear, and I believe it was a minor impurity. What is the ruling on my prayer?

Answer:
If you prayed in clothes that had impurity on them and you did not know about it, or you knew about it but forgot, your prayer is valid. Your prayer is valid. You should wash the clothes for the future, but what has passed is valid. However, if you remember that you were not in a state of wudu'—that your wudu' had been broken and you did not perform wudu'—then you must repeat the prayer. But if it is merely impurity on the garment or on the body, and you were forgetting it or did not know about it, then your prayer is valid. Yes.