The ruling on one who forgets the Maghrib prayer and leads the people in 'Isha'

The questioner:
I was traveling, so I intended to combine the Maghrib and 'Isha' prayers as a traveler. Then I arrived and prepared to stand for the 'Isha' prayer. I entered the mosque, but I prayed 'Isha', and I became the imam and descended. I was to pray Maghrib, but I remembered that in the third rak'ah. However, I continued praying 'Isha' for the people. When I finished the prayer, I prayed Maghrib again, then 'Isha'. Is my action correct? This is my situation.

The Shaykh:
Your action is wrong. It is obligatory that when you realized you had not prayed Maghrib, you should have stepped back. You should have stepped back and let the people pray for themselves, appointing an imam to lead them, while you pray Maghrib first, then 'Isha'. But since the matter has passed and you did this out of ignorance and repeated the prayer, your prayer is valid, if Allah wills, and the prayer of the followers is valid because they did not know about it.

The questioner:
He says: An explicit contract does not conflict with trivial criticism.

The Shaykh:
And it may be that if you remember the prayer and the time, and so on, you intend to complete it as a voluntary prayer. Then, when you finish, you stand and pray Maghrib, and after that you pray 'Isha'.