Remembering during the 'Isha' prayer that one has not prayed Maghrib

Question:
The questioner says: I delayed Maghrib with 'Isha' because I was traveling, and I prayed 'Isha' with the congregation of the mosque. I forgot to pray Maghrib first, and I remembered this during the final tashahhud of the 'Isha' prayer. Should I consider the 'Isha' prayer to be Maghrib, knowing that I was late by one rak'ah, or should I keep the 'Isha' prayer as my original intention and then pray Maghrib?

Answer:
You do not pray 'Isha' before Maghrib. But if you forgot Maghrib until you had finished the 'Isha' prayer—meaning you forgot Maghrib until you had completed the taslim of 'Isha'—and you realized during 'Isha' that you had not prayed Maghrib, then you make the 'Isha' prayer a voluntary prayer. You make the 'Isha' prayer a nafilah. Then you pray Maghrib, and then you pray 'Isha' after that. Yes.

The presenter:
May Allah reward you,