What is the difference between completing the four-rak'ah prayer and completing the Maghrib prayer behind a resident?

Question : What is the difference between this issue and the issue of the one who prays Maghrib behind the one who is praying 'Isha'?

Answer : The difference between them is apparent, because completing the four-rak'ah prayer is completing a characteristic that is prescribed in the case of being present, whereas completing Maghrib with four rak'ahs is not a prescribed characteristic in any way. Accordingly, we say that the shortening of the prayer in the case of the traveler is weighed against the obligation of following the imam. The obligation of following the imam, and completing the prayer for the traveler is not forbidden, meaning that the one who completes the prayer while traveling is not like the one who prayed Maghrib with four rak'ahs or prayed Fajr with four rak'ahs. Therefore, the difference between them is apparent. So, the one who prays with the resident imam while he is a traveler must complete the prayer, whether he caught the prayer from its beginning or in the middle of it.