The Book of Transactions
21/7. Chapter:
Ruling on selling Al-Musarrah (An animal in whose udder milk has been allowed to accumulate)
Sahih Muslim
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 (ﷺ) 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.
Reference : Sahih Muslim 1524dIn-book reference : Book 21, Hadith 33USC-MSA web (English) reference : Book 10, Hadith 3637