The ruling for the ma'mum if the imam prays a fifth rak'ah in a four-rak'ah prayer

The questioner : If the imam prays a fifth rak'ah in a four-rak'ah prayer, and someone behind him alerts him, and they are certain of the imam's mistake, do they complete the final tashahhud or do they stand up to pray?

The Shaykh : So here.

The questioner : In a four-rak'ah prayer, the imam prays a fifth, so they alert him and they are certain that he is in error, do they stand up from the prayer, meaning they leave the prayer, or do they complete the final tashahhud on their own?

The Shaykh : How do they want to dismiss it?

The questioner : Yes, we said now if they are certain, they separate from him.

The Shaykh : If they are certain that it is extra.

The questioner : Playing a band.

The Shaykh : Yes, they alert him first, and if he returns, that is better; if he does not return, they separate from him.

The questioner : Without completing it, and their prayer without, meaning it becomes a hospital.

The Shaykh : No, no, the meaning of separation is that you do not stand up with him; the meaning of separation is not that you leave your prayer, no, the meaning of separation is that you do not stand up with him, but you recite the tashahhud and say the taslim.