The individual prayer behind the congregation

Question:
A listener from the northern states of Sudan, named Tighur Baqil Ibrahim, sent a message containing a number of questions. In one of them, he says: A man arrived at the mosque and found that the prayer had already begun and the rows were completely full, and he did not find a place to stand with the imam. What should he do in such a situation? May Allah reward you with good.

Answer:
In the name of Allah, the Most Gracious, the Most Merciful. Praise be to Allah, Lord of the worlds, and may Allah send prayers and blessings upon our Prophet Muhammad, his family, and all his Companions. As for the one who entered and found the rows complete and did not find a gap to enter them, he should wait until someone comes to stand in the row behind him. He should not pray alone behind the row, because the Prophet (peace and blessings be upon him) forbade that and said, "There is no prayer for an individual behind the row." He also ordered the one who prayed alone behind the row to repeat the prayer. So he must wait, and as long as it is a mosque, he will not lack someone coming in to pray, whether from the neighbors of the mosque or others. Yes.