Ibn 'Umar (Allah be pleased with them) reported that the people of pre-Islamic days used to sell the meat of the slaughtered camel up to habal al-habala. And habal al-habala implies that a she-camel should give birth and then the (born one should grow young) and become pregnant. Allah's Messenger (ﷺ) forbade them that (this transaction).
Do not go out to meet riders to enter into transaction with them; none of you must buy in opposition to another, nor must you bid against one another; a townsman must not sell for a man from the desert, and do not tie up udders of carnels and sheep, and he who buys them after that has been done has two courses open to him: after he has milked them he may keep them if he is pleased with them, or he may return them along with a sit of dates if he is displeased with them.
Abu Huraira (Allah be pleased with him) reported that Allah's Messenger (ﷺ) forbade the (people) meeting the caravan (for entering into business transaction with them), and the selling of goods by a townsman on behalf of a man of the desert, and seeking by a woman the divorce of her sister (from her husband), and outbidding (against one another), and tying up the udders (of animals), and buying of (things) in opposition to one's brother.
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا ابْنُ أَبِي زَائِدَةَ، ح وَحَدَّثَنَا ابْنُ الْمُثَنَّى، حَدَّثَنَا يَحْيَى يَعْنِي ابْنَ سَعِيدٍ، ح وَحَدَّثَنَا ابْنُ نُمَيْرٍ، حَدَّثَنَا أَبِي كُلُّهُمْ، عَنْ عُبَيْدِ اللَّهِ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم نَهَى أَنْ تُتَلَقَّى السِّلَعُ حَتَّى تَبْلُغَ الأَسْوَاقَ . وَهَذَا لَفْظُ ابْنِ نُمَيْرٍ . وَقَالَ الآخَرَانِ إِنَّ النَّبِيَّ صلى الله عليه وسلم نَهَى عَنِ التَّلَقِّي .
Do not go out to meet merchandise in the way, (wait) until it is brought into the market. This hadith has been reported on the authority of Ibn Numair but with a slight change of words.