Is it permissible for a man to pray behind the rows alone if he does not find a gap and does not find anyone to stand with?

The questioner : You answered this in "Al-Irwaa'" regarding the prayer...
Is it permissible for a man to pray behind the rows alone if he does not find a gap between the rows, or should he wait for someone to enter the mosque so he can pray beside them? Knowing that it has reached me that one of the friends asked one of the distinguished scholars in the Kingdom of Saudi Arabia, and he holds the view that he should either wait for someone to enter and pray with him, or go and pray to the right of the imam?

The Shaykh : Yes, the question requires us to visualize a place where this entrant joins the row and has the option to align himself with the imam. If it is possible, it is obligatory; because in fact, the prayer of the follower behind the row alone is invalid. Peace be upon you. His prayer is invalid. More than one hadith has come regarding this: , and he said to the man: Repeat your prayer. Therefore, it is obligatory for this person who entered the mosque...