Musannaf Ibn Abi Shaybah 38833 — Marking the sacrificial animal

Abd al-Rahman bin Ali bin Shayban narrates from his father, Sayyiduna Ali bin Shayban (may Allah be pleased with him), who was part of the delegation: We set out until we came to the Prophet (peace and blessings be upon him). We gave him the pledge of allegiance and prayed behind him. He (peace and blessings be upon him) saw a man praying behind the row. The narrator said: The Prophet (peace and blessings be upon him) stood by him until he finished the prayer, and then he (peace and blessings be upon him) said: "Repeat your prayer, for there is no prayer for one standing behind the row." It is mentioned that the view of (Imam) Abu Hanifah is: This prayer of his is valid.