Abu Umar Zadhan says: I saw Sayyiduna Ali (may Allah be pleased with him) in Rahbah, and he was beseeching the people by Allah, saying: Whoever was present with the Messenger of Allah (peace and blessings be upon him) on the day of Ghadir Khumm, when he said what he said (from your response, the meaning of his statement is understood), then thirteen men stood up and testified that they had heard the Messenger of Allah (peace and blessings be upon him) say: Whoever I am his friend, Ali is also his friend.