A person who starts offering Salah alone then the congregational Salah begins

Q 7: What is the ruling on a person who started offering one of the Five Obligatory Daily Prayers alone and then the congregational Salah (Prayer) begins? Is it permissible for them to offer Salah again in congregation to get the reward of congregational Salah?

A: If a person has already started Salah alone and then the congregational Salah begins, it is desirable for them to shift the intention to Nafilah (supererogatory) Prayer, say the Taslim (salutation of peace ending the Prayer), and then join the congregation and offer the obligatory Prayer.May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.