Abu Dawud sad: Qais also transmitted it as Sufyan said: The version of Sufyan is authoritative.
In-book : Book 23, Hadith 12
English translation : Book 22, Hadith 3331
23. Commercial Transactions (Kitab Al-Buyu)
باب فِي الرُّجْحَانِ فِي الْوَزْنِ وَالْوَزْنِ بِالأَجْرِ