I stood up for the third rak'ah in a voluntary prayer by mistake; may I complete four rak'ahs?

Question:
Honorable Shaykh, may Allah grant you success. He says: In a voluntary prayer, I stood up for the third rak'ah by mistake. May I complete four rak'ahs? In a voluntary prayer, I stood up for the third rak'ah.

Answer:
No, not at night. At night, you must sit, because the night prayer is in pairs of two, so you do not stand up for a fifth. As for during the day, there is no fifth; it is changed from two to four, because it is permissible to perform voluntary prayer during the day in four rak'ahs. Yes, with one taslim. Yes.