The Book of Transactions
كتاب البيوع
Read the English translation first, with the original Arabic directly underneath.
Affirming that both parties to a transaction have the option (of canceling it) while they are still together
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).
حَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ، وَمُحَمَّدُ بْنُ الْمُثَنَّى، - وَاللَّفْظُ لِزُهَيْرٍ - قَالاَ حَدَّثَنَا يَحْيَى، - وَهُوَ الْقَطَّانُ - عَنْ عُبَيْدِ اللَّهِ، أَخْبَرَنِي نَافِعٌ، عَنِ ابْنِ عُمَرَ، قَالَ كَانَ أَهْلُ الْجَاهِلِيَّةِ يَتَبَايَعُونَ لَحْمَ الْجَزُورِ إِلَى حَبَلِ الْحَبَلَةِ . وَحَبَلُ الْحَبَلَةِ أَنْ تُنْتَجَ النَّاقَةُ ثُمَّ تَحْمِلَ الَّتِي نُتِجَتْ فَنَهَاهُمْ رَسُولُ اللَّهِ صلى الله عليه وسلم عَنْ ذَلِكَ .