What is the ruling if one stands in the night prayer up to a third and fourth rak'ah?

Question : Now, if the night and day prayers are performed in pairs of two, what is the ruling if a person stands in the night prayer up to a third and fourth?

Answer : The ruling is that his prayer is invalidated if he does so intentionally. Because if he intentionally adds to the two, he has contradicted the command of the Messenger of Allah (peace and blessings be upon him), which indicates that the night prayer is in pairs of two. And if he contradicts the command of the Messenger of Allah (peace and blessings be upon him), the Prophet (peace and blessings be upon him) said: .
For this reason, Imam Ahmad said that if one stands up to a third in the night prayer, it is as if he had stood up to a third in the Fajr prayer.
It is well known that if one stands up to a third in the Fajr prayer intentionally, what? The prayer is invalid by consensus. So likewise, if one stands up to a third in the voluntary night prayer, his prayer is invalid if he was intentional. And if he was forgetful, he must return as soon as he remembers; he must return as soon as he remembers, and he must prostrate for forgetfulness when? After the taslim, because of the addition.