Musannaf Ibn Abi Shaybah

Ibrahim Taimi narrates from his father, who says that his father went to Basra and bought a slave for four thousand. Then he sold him with a profit of four thousand. I said to him, "Father! If you go to Basra and trade in slaves, you will make a good profit." He said, "Do not say such a thing to me. By Allah, I did not feel any happiness in gaining this profit, nor did any desire arise in my heart to gain such profit again."