The Book of Zakat
وَحَدَّثَنِي عَمْرٌو النَّاقِدُ، حَدَّثَنِي إِسْمَاعِيلُ بْنُ إِبْرَاهِيمَ، أَخْبَرَنَا مَعْمَرٌ، عَنْ أَخِي الزُّهْرِيِّ، بِهَذَا الإِسْنَادِ . مِثْلَهُ وَلَمْ يَذْكُرْ " مُزْعَةُ " .This hadith has been narrated on the authority of the brother of Zuhri with the same chain of transmitters, but no mention has been made of the word" muz'a" (piece)
From Sahih Muslim, whose reports the scholars accept as authentic.