Musannaf Ibn Abi Shayba 13:3368

Abu Bakr narrated to us, he said: Jarir narrated to us, from Mughira, from Hammad, regarding two men who had a slave woman between them, whom they bought for forty dinars. They wanted to sell her for a profit (murabaha), and they were offered fifty dinars. One of them bought her (from the other), then he wanted to sell her for a profit. He said: He sells her for forty-five dinars; those five are his own profit.