The ruling on the prayer of the ma'mum (one praying behind the imam) if he stands to the left of the imam

Question:
May Allah guide you. He says: I missed the Maghrib prayer one day, and after the prayer had ended, I prayed with one of the people. I placed the man to my left and I became the imam, and I knew that the imam must be on the right, but I did not know which side was right and which was left, so I prayed Maghrib with this man. What is the ruling on our prayer in this situation? May Allah reward you with good.

Answer:
Your prayer is valid, but as for the man who prayed with you to your left, he must repeat the prayer; because he stood in a position other than that of the ma'mum. When the ma'mum is alone with the imam, he stands to his right; because when the Prophet (peace and blessings be upon him) stood to pray and Ibn 'Abbas, who was young, stood to his left, the Prophet (peace and blessings be upon him) turned him and placed him to his right. So this man must repeat the prayer. Yes.