The ruling on a resident praying behind a traveling imam

Question:
Please, Muhammad from Riyadh. Peace be upon you. And upon you be peace. Shaykh, may Allah keep you safe, I have two questions. The first is that I entered the mosque and the imam had finished the prayer, and a traveler came in with us and was praying two rak'ahs, which is the 'Isha' prayer, and he said, "You are two rak'ahs ahead of me, so I will pray two rak'ahs because he shortens the prayer." I said, "No, we are residents." And so on. Then, in the end, they prayed two rak'ahs and we prayed behind him, and we were residents. I do not know what is permissible in this case, O Shaykh. Thank you.

Answer:
Yes, there is no harm in this, but you must complete the prayer. When he says the taslim, you stand up and complete your prayer. This is something the Messenger (peace and blessings be upon him) did when he prayed with the people of Makkah during the Conquest of Makkah. He said, "O people of Makkah, we are a traveling people, so complete your prayer for yourselves." So when the imam who shortens the prayer says the taslim, the residents stand up after him and complete their prayer. Yes. Their prayer.