Musannaf Ibn Abi Shayba 13:3255

Abu Bakr narrated to us, he said: Hafs narrated to us, from Musa ibn Umayr, he said: I asked al-Hakam about a man who bought a slave girl, then had intercourse with her: "May he sell her for a profit (murabaha)?" He said: "No, until he clarifies [it]."