The traveler shortening the prayer as imam in the mosque of the residents

Question:
Honorable Shaykh, may Allah grant you success. The questioner says: I traveled to one of the cities, or to one of the nearby cities, for a period of two days. I entered one of the mosques to pray the 'Isha' prayer, and they put me forward to lead the prayer, so I shortened the prayer. After the prayer, they objected to me, so I explained to them that this is the Sunnah, and that this is the action of the Messenger (peace and blessings be upon him).

Answer:
If he did not alert them before the takbir of ihram, but instead alerted them that he is going to shorten the prayer because he is a traveler and instructed them to complete it, then he has made a mistake. This is misleading them, as they think he is following the Messenger (peace and blessings be upon him), who said: He clarifies to them before entering the prayer.