Sahih Bukhari
Sales and Trade
Volume: 003 / Book Number: 034 / Hadith Number: 353
Narrated 'Abdullah bin 'Umar:
Allah's Apostle forbade the sale called 'Habal-al-Habala which was a kind of sale practiced in the Pre-lslamic 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.