Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Musa bin Salim, may Allah have mercy on him, that when Hajjaj exiled the people of the region, a woman came to me with a letter. She thought that her father had been freed. (She said:) This is the one whom Talha bin Ubaidullah, may Allah be pleased with him, bought from so-and-so, who had bought him from a young man for dinars or dirhams, for five hundred dirhams which were good, excellent, and fine. And he also paid the price, and freed him for the sake of Allah. Then, there is no way for anyone except the way of wala (allegiance). Thus, Zubair bin Al-Awwam, may Allah be pleased with him, Abdullah bin Aamir, and Ziyad bore witness.