Is it obligatory to repeat the prayer of one who prayed alone behind the rows?

Question:
The questioner, Abbas, says: I prayed the 'Asr prayer alone behind the rows, and no one came. The row was complete, so one of the brothers in the first row objected to me and said, "Repeat the prayer."

Answer:
Yes, he is right; it is obligatory for you to repeat it. The Prophet (peace and blessings be upon him) saw a man praying alone behind the rows, so he ordered him to repeat it. He (peace and blessings be upon him) said, "There is no prayer for one who is alone behind the rows."