Hazrat Abdur Rahman bin Ali (may Allah be pleased with him) narrates from his father Ali (may Allah be pleased with him) bin Shaiban, who was a part of the delegation, that we set out until we presented ourselves before the Holy Prophet (peace and blessings be upon him). So we pledged allegiance to him, and we prayed behind him. The Prophet (peace and blessings be upon him) saw a man praying behind the row. The narrator says: The Holy Prophet (peace and blessings be upon him) stood by him until he finished his prayer, then the Prophet (peace and blessings be upon him) said: "Repeat your prayer, for there is no prayer for the one who stands behind the row." And (Imam) Abu Hanifa's opinion has been mentioned that: this prayer of his is valid.