Ruling on repeating the prayer when there is impurity on the clothing

Question:
May Allah reward you, Your Eminence, father. The questioner says: I was traveling and I combined and shortened the Maghrib and 'Isha' prayers. During the Maghrib prayer, I remembered that there was the vomit of a nursing infant on my clothes, but I was in doubt about the purity of the infant's vomit, and I did not know that it was impure. So, is it obligatory for me to repeat the prayer?

Answer:
Yes, because you knew of the impurity and did not wash it. You prayed while you knew of it, so you must wash it and repeat both prayers completely. You repeat the Maghrib and 'Isha' prayers in full, four rak'ahs. Yes.