From Sahih Bukhari (Hadith 2143):
Narrated `Abdullah bin `Umar:Allah's Messenger (ﷺ) forbade the sale called 'Habal-al-Habala which was a kind of sale practiced in the Pre- Islamic Period of ignorance. One would pay the price of a she-camel which was not born yet would be born by the immediate offspring of an extant she-camel
Reference: Bukhari 2143