What was the sale that Prophet Muhammad (peace be upon him) forbade known as?
 Narrated `Abdullah bin `Umar:                     Allah's Apostle 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.