حَدَّثَنَا ابْنُ أَبِي عُمَرَ، حَدَّثَنَا سُفْيَانُ، عَنْ أَيُّوبَ، عَنْ مُحَمَّدٍ، عَنْ أَبِي هُرَيْرَةَ، قَالَ قَالَ رَسُولُ اللَّهِ صلى الله عليه وسلم ‏"‏ مَنِ اشْتَرَى شَاةً مُصَرَّاةً فَهُوَ بِخَيْرِ النَّظَرَيْنِ إِنْ شَاءَ أَمْسَكَهَا وَإِنْ شَاءَ رَدَّهَا وَصَاعًا مِنْ تَمْرٍ لاَ سَمْرَاءَ ‏"‏ ‏.‏

Abu Huraira (Allah be pleased with him) reported Allah's Messenger (PBUH) as saying: He who buys a goat having its udder tied up has two courses left for him. He may retain it, and if he desires may return it along with a sa' of dates and not wheat. Translation Not Available

Book Ref: Sahih Muslim Book 21 Hadith 3637
Web Ref:  Sahih Muslim Book 10 Hadith 1524 d