A man prayed 'Isha' behind the imam and did not recite the tashahhud or the Ibrahimiyyah prayer, so what is the ruling on his prayer?

Question:
He says: Honorable Shaykh, may Allah grant you success, a man prayed 'Isha' behind the imam and did not recite the tashahhud or the Ibrahimiyyah prayer, so what is the ruling on his prayer? A man. Prayed 'Isha' behind an imam and did not recite the tashahhud or the Ibrahimiyyah prayer, so what is the ruling on his prayer?

Answer:
This is leaving out a pillar of the prayer, and he was required to perform a rak'ah after the taslim. The imam performs a rak'ah, but when the time has passed and the interval has become long, he must repeat the prayer from the beginning, because he left out a pillar of it and did not make it up in a short time. He performs a rak'ah, so if he left out the prayer, he left out the tashahhud and the prayer upon the Messenger (peace and blessings be upon him), leaving out a pillar, but he does not just come and perform a rak'ah; he returns and recites the tashahhud, recites the tashahhud and the Ibrahimiyyah prayer, then says the taslim. And if the time has passed and he did not do this, he repeats the prayer anew. Yes.