What is the ruling on praying in a garment that has impurity on it, when one does not know when it got there?

Question : The questioner says: A man found impurity in his clothes, and he did not know when this impurity got there. What should he do? And does he repeat the prayers he prayed in this garment?

Answer : He does not repeat the prayer; his prayer is valid. This is because if he does not know whether the impurity was after the prayer or before it, the default is that it was after the prayer. In fact, even if he knew it was before the prayer because it was dry, but he did not know about it, his prayer is valid. In fact, even if he knew it was before the prayer and knew about it, but he forgot to wash it and prayed in it, his prayer is valid. The evidence is the saying of Allah the Exalted: And another evidence is that the Prophet (peace and blessings be upon him) prayed one day in his sandals, and the Companions prayed in their sandals with their Messenger (peace and blessings be upon him), because they have in him a good example. And we likewise pray in our sandals, following the example of the Messenger of Allah (peace and blessings be upon him). So he took off his sandals while he was praying.
And to complete the Companions' following of his example, they took off their sandals because they had worn them following his example. So when he took them off, they took theirs off. When he finished the prayer, he asked them, "What is the matter that you took off your sandals?" They said, "O Messenger of Allah, we saw you take off your sandals, so we took off our sandals." He said: So he took them off. Allahu Akbar. Did the Messenger know? Answer: Yes, because he does not know the unseen.
He does not know the unseen, so he did not know to this extent. But from the protection of Allah, Blessed and Exalted is He, for His Messenger, that he would pray with something in it that had filth, He sent Jibril and informed him that there was filth in them. Because it appears that Jibril came to the Messenger (peace and blessings be upon him) as a messenger from Allah. So the Messenger (peace and blessings be upon him) took off his sandals and continued in his prayer, and he did not exit from it, even though at the beginning of the prayer he was wearing what?
Two sandals in which there was filth, but he did not know, so he was excused. This indicates that if a person prays with something impure, whether sandals, trousers, clothes, or a head covering, and he is ignorant of it, his prayer is valid. If he knows during the prayer, it is obligatory for him to take off what can be taken off. Let us look: the head covering can be taken off, and he remains with what is on him; there is nothing on him, no obstacle. Good. The one in the state of safety has a shirt on him. Yes, he has a shirt on him. Does he take off the trousers?
Can he? Can he, yes, he takes off the trousers. Good. If he has nothing on him but the trousers? He does not take them off. But what does he do? He exits from his prayer and changes the trousers. He must exit. Or he has only a shirt on him and knows it is impure, and he has nothing on him but the shirt. What does he do? Does he take it off? It is not possible. Then he exits from his prayer and changes the garment or washes the garment. Is that clear, everyone?
Good. And based on this, we say in answer to the question: If he prayed in an impure garment and does not know whether the impurity was before the prayer or not, his prayer is valid. In fact, even if he knew it was before the prayer because it was dry, but he did not know about it, his prayer is valid. In fact, even if he knew about it before the prayer and then forgot to wash it and prayed, his prayer is valid. But I tell you: hasten to wash the impurity and do not rely on memory. That is, a person should not rely on himself and say, "When the time for prayer comes, I will wash the garment." No, because he might forget. For this reason, it was among the guidance of the Messenger of Allah (peace and blessings be upon him) to hasten to wash the impurity. A small boy who had not yet realized what was happening, who was being fed on milk, was brought to him. He placed him on his lap, and this is from his humility, may Allah's prayers and blessings be upon him. He was brought the children and he placed them on his lap. The boy urinated. The boy urinated on the lap of whom?
When they bring this, he is not shy. Yes. And he did not know, and he did not know that he was in front of the Messenger, may the prayers and blessings of Allah be upon him. The important thing is that he urinated on the lap of the Messenger of Allah (peace and blessings be upon him). So he called for water immediately. He called for water and poured it on it. He poured it on the urine without washing and without rubbing, because the urine of a small boy who has not yet eaten food is sufficient with sprinkling. Good. I brought this hadith as a proof that a person should hasten to what?
To wash the impurity. Another example: A Bedouin came, and the Bedouin is a desert dweller who lives in the desert and is ignorant of many rulings. So he entered the mosque, and the mosque of the Messenger, may the prayers and blessings of Allah be upon him, was partly roofed and partly an open area without a roof. So he turned aside and began to urinate in the middle of the mosque, thinking he was in the desert. When he was constrained by the urge to urinate, he sat and urinated, so it became apparent in the mosque. The Companions, may Allah be pleased with them, disapproved of him and rebuked him, saying, "Stop, stop!" But the Messenger of Allah (peace and blessings be upon him), to whom Allah granted wisdom and mercy, stopped them. He said, "Leave him, let him finish urinating." When he finished, the Prophet (peace and blessings be upon him) ordered that a bucket of water be poured on his urine, meaning to dip a bucket. He ordered it immediately; he did not say, "Let us leave it until the sun and wind dry it." Rather, he ordered it immediately to be purified. Therefore, O dear brother, if impurity affects your body or your garment, hasten to remove it. Do not say, "When the time for prayer comes, I will wash it." Do not say this. Hasten, because you may forget, and at that time you will have prayed in an impure garment. And even if you are excused, it is not recommended. Yes.