The Ma'mum being obligated to offer a complete Rak`ah in case the Imam forgets one Sujud

Q 1: A man offered the Zhuhr (Noon) Prayer in congregation. In one Rak‘ah (unit of Prayer), the Imam (the one who leads congregational Prayer) missed one of the two Sujud (prostrations), but the Ma’mums (persons being led by an Imam in Prayer) reminded him. After reciting the final Tashahhud (a recitation in the sitting position in the second/last unit of Prayer), the Imam performed Sujud-ul-Sahw (Prostration of Forgetfulness). None of the Ma’mums disapproved of what he did. Should the Ma’mums also follow the Imam in saying the Taslim (salutation of peace ending the Prayer), then offer a Rak‘ah after which they perform Sujud-ul-Sahw; or they should not say the Taslim but rise to offer another Rak‘ah and then perform Sujud-ul-Sahw; or are they not required to perform Sujud-ul-Sahw? If they have to perform Sujud-ul-Sahw, when should it be performed, before or after the Taslim? Please advise us, and may Allah reward you greatly.

A: If the Ma’mum knows that the Imam has unintentionally omitted a Sujud, they should not say the Taslim with the Imam. If the omitted Sujud was not in the last Rak‘ah, they should offer another Rak‘ah instead of the one in which a Sujud was missed out, then recite the final Tashahhud and say the Taslim.If the omitted Sujud was in the last Rak‘ah, the Ma’mum should offer the Sujud that was omitted before saying the Taslim and then recite the final Tashahhud and say the Taslim. If there was a long intervening period before the omitted Sujud was made up for, then the whole Salah (Prayer) should be offered again.