(23) Commercial Transactions (Kitab Al-Buyu)
كتاب البيوع
(1252) Chapter: Regarding Giving A Little More When Weighing And Weighing For A Fee
(7) باب فِي الرُّجْحَانِ فِي الْوَزْنِ وَالْوَزْنِ بِالأَجْرِ
Sunan Abi Dawud 3338 
Narrated Ibn Abi Rizmah:
I heard my father say: A man said to Shu'bah: Sufyan opposed you (i.e. narrated a tradition which differs from your version). He replied: You racked my mind. I have been told that Yahya b. Ma'in said: If anyone opposes Sufyan, the version of Sufyan will be acceptable.
حَدَّثَنَا ابْنُ أَبِي رِزْمَةَ، سَمِعْتُ أَبِي يَقُولُ، قَالَ رَجُلٌ لِشُعْبَةَ خَالَفَكَ سُفْيَانُ ‏.‏ قَالَ دَمَغْتَنِي ‏.‏ وَبَلَغَنِي عَنْ يَحْيَى بْنِ مَعِينٍ قَالَ كُلُّ مَنْ خَالَفَ سُفْيَانَ فَالْقَوْلُ قَوْلُ سُفْيَانَ ‏.‏
Grade :  Sahih (Al-Albani) صحيح  (الألباني)حكم :
Reference : Sunan Abi Dawud 3338
In-book reference : Book 23, Hadith 13
English translation : Book 22, Hadith 3332