عَنْ جَابِرٍ قَالَ: إِنَّ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ نَهَى عَنِ الثُّنْيَا إِلَّا أنْ يُعلمَ. رَوَاهُ التِّرْمِذِيّ

Al-‘Adda’ b. Khalid b. Haudha brought out a document to this effect

This is what al-‘Adda’ b. Khalid b. Haudha brought from Muhammad, God’s Messenger. He bought from him a slave, or a slave woman, with no disease or wickedness, or anything unlawful*, a transaction between two Muslims. Tirmidhi transmitted it, saying this is a gharib tradition.* This might be bad character on the part of the slave or unlawful enslavement.