What should one do if he prays with the congregation and then remembers that he did not pray the prayer before it?

Question:
May Allah reward you, Your Eminence, father. The questioner says: A man prayed in congregation, then remembered during the prayer that he had not prayed the prayer before it. Does he make it up after finishing the current one? Or does he consider the prayer he is currently performing as the missed one, and then perform the second one?

Answer:
If he remembers the missed prayer, he breaks off the prayer he is in and performs the missed one first, the one before it, and then prays the current one, because the order is obligatory. If he completes it as a voluntary prayer, if he completes it as a voluntary prayer, then when he says the closing salam, he stands up and performs the first one, then performs the second one after it, and there is no harm in that. Yes. So he either breaks it off or completes it as a voluntary prayer. Yes.