Evidence that one who finds a gap in the row should enter it?

Question : What is the evidence that he should enter it?

Answer : We forgot to mention the evidence. The evidence is the command of the Messenger (peace and blessings be upon him) to stand close together, for his command to stand close together necessitates closing the gaps. It is also narrated from the Prophet (peace and blessings be upon him) that whoever connects a row, Allah will connect him, and that Allah and His angels send blessings upon those who connect the rows.