The ruling on the prayer of a single person behind the rows

Question:
Finally, he says: Honorable Shaykh, what is the stronger position among the opinions of the scholars and jurists regarding the prayer of a single person, if one has performed several prayers alone in the place where he prayed?

Answer:
The stronger position is that the prayer of a single person behind the row is not valid. The Messenger of Allah (peace and blessings be upon him) said: There is no prayer for a single person behind the row. Because the Messenger of Allah (peace and blessings be upon him) saw a man praying alone behind the row, so he ordered him to repeat the prayer. Therefore, the prayer is not valid. If the prayers you performed are few and limited, and you are able to make them up, then you make them up. But if they are many, or you do not know their number, then you should be careful in the future not to pray alone behind the row, and as for what has passed, may Allah grant you well-being.