The ruling on a traveler who prays behind a resident and concludes the prayer after two units

Question:
I am a pilgrim who prayed behind the imam of the Haram in the night prayer. After the imam stood for the third unit, I concluded the prayer, believing that it is permissible for me to shorten the prayer. Is my prayer valid? If it is obligatory for me to repeat it, should I repeat it in full or shortened? Please note that I am still residing in Mina and am considered a traveler. Please answer us, may Allah reward you.

Answer:
If a traveler prays with a resident, it is obligatory for him to complete the prayer, as the Sunnah has come with this. The fact that you concluded the prayer after he stood for the third unit is an error on your part, and you must make up the prayer. You must make it up as four units, even if you were a traveler; because everyone who prays behind a resident imam prays four units. If one concludes the prayer after two units, he has erred, and he must perform four units; because one who prays behind a resident completes the prayer with him and makes it up as four units, because it became obligatory upon him by joining the resident imam.