Sahih al-Bukhari 3680
In-book no 3680حَدَّثَنَا مُسَدَّدٌ، حَدَّثَنَا يَحْيَى، عَنْ عُبَيْدِ اللَّهِ، أَخْبَرَنِي نَافِعٌ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ كَانَ أَهْلُ الْجَاهِلِيَّةِ يَتَبَايَعُونَ لُحُومَ الْجَزُورِ إِلَى حَبَلِ الْحَبَلَةِ، قَالَ وَحَبَلُ الْحَبَلَةِ أَنْ تُنْتَجَ النَّاقَةُ مَا فِي بَطْنِهَا، ثُمَّ تَحْمِلَ الَّتِي نُتِجَتْ، فَنَهَاهُمُ النَّبِيُّ صلى الله عليه وسلم عَنْ ذَلِكَ.
Narrated Ibn `Umar: In the pre-lslamic period of ignorance the people used to bargain with the meat of camels on the principle of Habal-al-Habala which meant the sale of a she-camel that would be born by a she-camel that had not yet been born. The Prophet (ﷺ) forbade them such a transaction.