That the Prophet ﷺ said: "Whoever purchases an animal that has not been milked, then he retains the option for three days. If he returns it, then he is to return with it a Sa' of food, not Samra' "
عَنِ النَّبِيِّ ﷺ قَالَ مَنِ اشْتَرَى مُصَرَّاةً فَهُوَ بِالْخِيَارِ ثَلاَثَةَ أَيَّامٍ فَإِنْ رَدَّهَا رَدَّ مَعَهَا صَاعًا مِنْ طَعَامٍ لاَ سَمْرَاءَ