What is the ruling on one who stands up from the first tashahhud, then returns to it and performs sujud al-sahw before the taslim?
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The questioner : In the 'Isha' prayer, the imam made a mistake and stood up for the third rak'ah without sitting for the first tashahhud. The people behind him said "Subhan Allah," so he sat down and returned to the first tashahhud. Before the taslim, he performed sujud al-sahw and then said the taslim. Then one of the... said: "If he knew this ruling, his prayer is invalid, but if he did not know, I do not know his ruling. However, I think we should repeat the prayer, so we repeated it. Is this permissible?"
The Shaykh : As for your repeating it based on the assumption that this is obligatory upon you, you have the reward, if Allah wills. As for the correct ruling: if a person stands up from the first tashahhud until he is fully standing, it is not permissible for him to return. If he returns intentionally, his prayer is invalid. However, if he was ignorant, it is not invalid. So, if a person leaves the first tashahhud and is fully standing, we say: do not return, continue in your prayer and complete it, then perform sujud al-sahw before the taslim.
However, if he remembers before he is fully standing, he returns and completes it. Did you understand?
The questioner : Even if...?
The Shaykh : Whether he recited or did not recite, he does not return. If he is fully standing, he does not return. This is regarding the first tashahhud. But if he forgot a prostration and stood up, he returns, even if he recited al-Fatihah and even if he bowed. He must return to what he left. For example, if he stood up from the first prostration, then recited al-Fatihah, then bowed, and remembered that he had only prostrated once, we say: immediately sit and say: "My Lord, forgive me and have mercy on me," then prostrate, then complete the prayer, then perform sujud al-sahw after the taslim.
The Shaykh : As for your repeating it based on the assumption that this is obligatory upon you, you have the reward, if Allah wills. As for the correct ruling: if a person stands up from the first tashahhud until he is fully standing, it is not permissible for him to return. If he returns intentionally, his prayer is invalid. However, if he was ignorant, it is not invalid. So, if a person leaves the first tashahhud and is fully standing, we say: do not return, continue in your prayer and complete it, then perform sujud al-sahw before the taslim.
However, if he remembers before he is fully standing, he returns and completes it. Did you understand?
The questioner : Even if...?
The Shaykh : Whether he recited or did not recite, he does not return. If he is fully standing, he does not return. This is regarding the first tashahhud. But if he forgot a prostration and stood up, he returns, even if he recited al-Fatihah and even if he bowed. He must return to what he left. For example, if he stood up from the first prostration, then recited al-Fatihah, then bowed, and remembered that he had only prostrated once, we say: immediately sit and say: "My Lord, forgive me and have mercy on me," then prostrate, then complete the prayer, then perform sujud al-sahw after the taslim.