Should someone do if they mistakenly

Q 3: If someone who is offering the Salah (prayer) says one Taslim (salutation of peace ending the Prayer) to their right, and then, before saying the second Taslim, they remember that their Salah is incomplete, should they complete the Taslim and then complete their Salah or complete their Salah before saying the second Taslim?

A: If they have done one Taslim mistakenly and then remembered, it is obligatory on them to complete their Salah, and the Taslim that they said mistakenly will be cancelled. They should not just say the second Taslim, but conclude their Salah by saying two Taslims and do a Sujud-ul-Sahw (Prostration of Forgetfulness) before or after the Taslim.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.