Sometimes I go to the Masjid (mosque)

Q 12: Sometimes, when I enter the Masjid (mosque), I find two people performing a congregational Prayer. If I want to join them, should I move the Imam (the one who is leading the congregational Prayer) or the Ma'mum (the person being led by the Imam in Prayer)?

(Part No. 8; Page No. 23)  A: This matter is flexible; you may move the Ma'mum back or the Imam forward. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.