Abu Hurairah (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings of Allah be upon him) forbade the sale of Gharar __QUR_N__ and the sale of Hasat. __XREF_N__ Imam Tirmidhi says:
1- The hadith of Abu Hurairah (may Allah be pleased with him) is Hasan Sahih,
2- In this chapter, there are also ahadith from Ibn Umar, Ibn Abbas, Abu Sa'id, and Anas (may Allah be pleased with them),
3- The people of knowledge act upon this hadith; they consider the sale of Gharar to be disliked,
4- Shafi'i says: The sale of fish that are in water, the sale of a runaway slave, the sale of birds flying in the sky, and other similar sales are of the category of Gharar,
5- And by the sale of Hasat is meant that the seller says to the buyer: "When I throw a pebble towards you, the sale between me and you becomes binding." This is similar to the sale of Munabadhah. And this was one of the types of sales in the days of ignorance. __REF_N__