Sayyiduna Wabisah bin Ma'bad (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) finished the prayer, and a man was praying alone behind the rows, so he (peace and blessings be upon him) ordered him to repeat his prayer.
Hadith Referenceالمعجم الكبير للطبراني / باب الواو / 18593