Sayyiduna al-Adda' bin Khalid bin Hawdhah (may Allah be pleased with him) said: Shall I not read to you a document that the Messenger of Allah (peace and blessings be upon him) had written for me? We said: Certainly. In it was written: "In the name of Allah, the Most Gracious, the Most Merciful. This is what al-Adda' bin Khalid bin Hawdhah bought from Muhammad, the Messenger of Allah (peace and blessings be upon him). He bought from him (peace and blessings be upon him) a male slave, or a female slave (Uthman was in doubt), as the sale of a Muslim, with no defect, no deception and no foulness." Al-Asma'i said: I asked Sa'id bin Abi Arubah about 'gha'ilah' and he said: Running away, theft and zina. And I asked him about 'khibthah', and he said: The (unlawful) selling of people under covenant with the Muslims.
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 15107