The Book of Emancipating Slaves
وَحَدَّثَنَاهُ أَحْمَدُ بْنُ عُثْمَانَ النَّوْفَلِيُّ، حَدَّثَنَا أَبُو دَاوُدَ، حَدَّثَنَا شُعْبَةُ، بِهَذَا الإِسْنَادِ نَحْوَهُ .This hadith has been narrated on the authority of Shu'ba with the same chain of transmitters
From Sahih Muslim, whose reports the scholars accept as authentic.