The ruling on praying behind the row alone

Question:
As for his second question, he says: If one of us enters the mosque and finds that the first row is full, and there is no one with him in the second row, and he stands up to ask for another person from the first rows, and one of those people refuses, what should he do in this situation?

Answer:
If a person comes and the prayer is already being performed, he should try to enter the row, looking for a gap to join the row. If the row is complete and does not accept an addition, and he is able to enter to the right of the imam, it is obligatory for him to do so. If neither of these is possible—there is no space in the row and it is not easy to enter to the right of the imam—then he should wait until someone comes to pray with him. This is because the Prophet (peace and blessings be upon him) forbade praying alone behind the row and ordered the one who prays alone behind the row to repeat the prayer. So he should wait until someone comes to stand with him. Yes.