Sayyiduna Abu Hurairah (may Allah be pleased with him) narrates: The Prophet (peace and blessings of Allah be upon him) forbade the sale involving pebbles. (Imam Ibn Hibban, may Allah have mercy on him, says:) The sale involving pebbles is this: A man comes to a flock of goats or a group of some animals and then says to the seller: I will throw this pebble, so whichever animal this pebble falls upon, it will be mine for such and such amount.