The ruling on a traveler shortening the prayer if he joins behind a resident imam

Question:
Ah. This questioner says. He asks about the prayer. He says: I was traveling and the time for the 'Asr prayer came upon me. While I was entering the mosque, I found the imam in the first tashahhud, so I joined him with the intention of shortening the 'Asr prayer to two rak'ahs. When he finished the prayer, I finished it with him. After that, one of the people told me that this is not permissible, and that it is necessary to complete the prayer with four rak'ahs. I ask for your guidance?

Answer:
Yes. And likewise, if one joins the imam who completes the prayer, it is obligatory for him to complete it, even if he did not catch anything but the end of the prayer. So whoever prays with an imam who completes the prayer, it is obligatory for him to complete it, and it is not permissible for him to shorten it, because following the imam is obligatory. The Prophet (peace and blessings be upon him) said: . It is not permissible for a traveler who shortens the prayer, if he prays with a resident imam who completes the prayer, to shorten it behind him. Rather, he completes the prayer following him, following the imam. Yes.