(26) باب أَيَّامِ الْجَاهِلِيَّةِ
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.
Reference: Sahih al-Bukhari 3843
In-book reference: Book 63, Hadith 69
USC-MSA web (English) reference(deprecated numbering scheme): Vol. 5, Book 58, Hadith 183