if a Ma'mum (a person being led by an Imam in Prayer) performs the Taslim (salutation of peace ending the Prayer) forgetfully before the Imam, during the Tashahhud (a recitation in the sitting position in the last unit of Prayer), should they return to perform Salah (Prayer) with the Imam or what should they do?
They have to return to perform Salah following the Imam and then say the Taslim after the Imam. (Part No. 7; Page No. 147) May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.