One who stands alone behind the row

Hilal bin Yasaf said: Ziyad bin Abi al-Ja'd took me by the hand and stood me before an elderly man in al-Raqqah whose name was Sayyiduna Wabisah bin Ma'bad (may Allah be pleased with him). He said: A man prayed alone behind the row, so the Prophet (peace and blessings be upon him) ordered him to repeat the prayer.

Sayyiduna Ali bin Shayban (may Allah be pleased with him) said: We came as a delegation to the Prophet (peace and blessings be upon him). We pledged allegiance at his blessed hand and prayed behind him. He (peace and blessings be upon him) saw a man praying alone behind the row, so he stood by him; when the man finished the prayer, he said: "Pray again, for the one who prayed behind the row, his prayer is not valid."

Ibrahim said: He will pray again.

Ata said: Do not stand alone.

Sayyiduna Wabisah bin Ma'bad (may Allah be pleased with him) said: A man prayed alone behind the rows, so the Prophet (peace and blessings be upon him) ordered him to repeat the prayer.