If the imam stands for a fifth rak'ah in a four-rak'ah prayer; should the congregation follow him?

Question:
Honorable Shaykh, may Allah grant you success. He says: If the imam stands for a fifth rak'ah in a four-rak'ah prayer, should the ma'mum (those praying behind the imam) sit and wait for him, or should they say the taslim (closing salam) and leave him? If the imam stands for a fifth rak'ah in a four-rak'ah prayer

Answer:
Why don't they alert him? They should alert him. Subhan Allah, Subhan Allah. If they persist, and they are certain that it is an extra rak'ah, it is not permissible for them to follow him. It is not permissible for them to follow him. They should continue sitting. If they wish, they may say the taslim for themselves, or if they wish, they may wait and say the taslim with him. Yes. Allah the Exalted knows best. May Allah send prayers and peace upon our Prophet Muhammad, and upon his family and his Companions.