The ruling on praying alone behind the rows while waiting for the row to be completed

Question:
The brother Sa'dun says in this question: I prayed alone behind the row because I did not find an opening in the row. There were people outside the mosque performing wudu, but they were delayed considerably, and I feared that I would miss the first rak'ah, so I prayed alone behind the row. After the second rak'ah, the row was completed. What is the ruling on my prayer?

Answer:
This is not permissible for you, especially since you knew that there were people who would come to the mosque once they finished their wudu. It is obligatory for you to wait until they arrive and you join them in the row, so that you form a row behind the row, even if there is a benefit in the sunnah.
Because it is not permissible for you to pray alone behind the row, for the Prophet (peace and blessings be upon him) said, "There is no prayer for one who prays alone behind the row." And in another hadith, it is stated that So you must repeat this prayer that you prayed alone behind the row. Yes.