If impurity falls on the garment, is it obligatory to wash it immediately, and what is the ruling if one prays while forgetting it?

Question:
He says: Honorable Shaykh, may Allah grant you success, if impurity affects the body, is it obligatory to wash it immediately? And what is the ruling if one becomes aware of it but does not wash it immediately, but rather prays while it is on him, forgetting it? Does he have to repeat the prayer?

Answer:
Yes, if one becomes aware of the impurity, he should hasten to wash it so that he does not forget it, as I mentioned that he should hasten to wash it so that he does not forget it. But if he leaves it and forgets, and prays, his prayer is valid. However, he should wash it for the future and not leave it.