It is narrated from Ibn Abbas (may Allah be pleased with them) that he disliked the sale of wool on sheep and the sale of milk in the udders of goats without measuring.
Hadith Referenceمسند الإمام الشافعي / كتاب البيوع / 1458
Hadith Takhrijاسناده قوی بشواهد اخرجه البيهقي : 340/5 - وفى المعرفة السنن والآثار له (3509) - وعبد الرزاق (14374) - وابن ابى شيبة (20500) - (21905)۔