The Messenger of Allah ﷺ as saying: Do not go out to meet riders to conduct business with them ; none of you must buy in opposition to one another; and do not tie up the udders of camels and sheep, for he who buys them after that has been done has two courses open to him after milking them: he may keep them if he is pleased with them, or he may return them along with a sa' of dates is he is displeased with them.  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ لاَ تَلَقَّوُا الرُّكْبَانَ لِلْبَيْعِ وَلاَ يَبِعْ بَعْضُكُمْ عَلَى بَيْعِ بَعْضٍ وَلاَ تُصَرُّوا الإِبِلَ وَالْغَنَمَ فَمَنِ ابْتَاعَهَا بَعْدَ ذَلِكَ فَهُوَ بِخَيْرِ النَّظَرَيْنِ بَعْدَ أَنْ يَحْلِبَهَا فَإِنْ رَضِيَهَا أَمْسَكَهَا وَإِنْ سَخِطَهَا رَدَّهَا وَصَاعًا مِنْ تَمْرٍ  

The Prophet ﷺ as saying: If anyone buys sheep whose udders have been tied up, he has option for three days: he may return it if he desires with a sa' of any grain, not (necessarily) wheat.  

أَنَّ النَّبِيَّ ﷺ قَالَ مَنِ اشْتَرَى شَاةً مُصَرَّاةً فَهُوَ بِالْخِيَارِ ثَلاَثَةَ أَيَّامٍ إِنْ شَاءَ رَدَّهَا وَصَاعًا مِنْ طَعَامٍ لاَ سَمْرَاءَ  

The Messenger of Allah ﷺ as saying: If anyone buys sheep or goat whose udders have been tied up and he milked it, he may keep it if he is pleased with it, or he may return it if he is displeased with it. There is one sa' of dates (which he must give to the seller) for milking it.  

قَالَ رَسُولُ اللَّهِ ﷺ مَنِ اشْتَرَى غَنَمًا مُصَرَّاةً احْتَلَبَهَا فَإِنْ رَضِيَهَا أَمْسَكَهَا وَإِنْ سَخِطَهَا فَفِي حَلْبَتِهَا صَاعٌ مِنْ تَمْرٍ  

The Prophet ﷺ said: If anyone buys a sheep whose udders have been tied up, he has option for three days (for decision). If he returns it, he should return with it wheat equal to its milk or double of it.  

قَالَ رَسُولُ اللَّهِ ﷺ مَنِ ابْتَاعَ مُحَفَّلَةً فَهُوَ بِالْخِيَارِ ثَلاَثَةَ أَيَّامٍ فَإِنْ رَدَّهَا رَدَّ مَعَهَا مِثْلَ أَوْ مِثْلَىْ لَبَنِهَا قَمْحًا