The imam stood up for the third rak'ah in the tarawih prayer, and the worshippers alerted him, but he did not return to his seat; instead, he made it four rak'ahs. Is our prayer valid?

Question:
Honorable Shaykh, may Allah grant you success, he says: An imam led the people in the tarawih prayer in Ramadan. He stood up for the third rak'ah and was alerted, but he did not return to his seat; rather, he made it four rak'ahs. Is the prayer valid in that case?

Answer:
The night prayer is two by two, and the tarawih prayer is two by two. So do not follow him. If he stands up for the third rak'ah, do not follow him. Sit down, watch him, say the taslim, and leave him.