Musannaf Ibn Abi Shaybah

It is narrated from Muhammad, may Allah have mercy on him, that a man sold his slave. There was a disease in the slave's hair, but he concealed this disease. When the buyer came to know of the disease, he brought the case before Hazrat Shurayh. Hazrat Shurayh said that you concealed the defect. He ordered that the slave be returned.