Ibn ‘Umar reported God’s Messenger as saying,“Do not go out to meet merchandise, [but wait] till it is brought down to the market.”(Bukhari and Muslim.)

He reported God’s Messenger as saying,“One must not offer more than the amount agreed by his brother*, or ask a woman in marriage when his brother has done so, unless he permits him.”*i.e. when the parties have already agreed on a price. Muslim transmitted it.

Abu Huraira reported God’s Messenger as saying,“A man must not offer a price above that offered by his brother Muslim.”Muslim transmitted it.

Jabir reported God’s Messenger as saying,“A townsman must not sell for a man from the desert; if you leave people alone, God will give them provision from one another.”Muslim transmitted it.

Abu Sa'id al-Khudri said that God’s Messenger forbade two ways of dressing and two types of business transaction. He forbade mulamasa and munabadha in a business transaction. Mulamasa means that a man touches another’s garment with his hand, whether at night or by day, without turning it over any more than that involves. Munabadha means that a man throws his garment to another and the other throws his garment, that confirming their contract without inspection or mutual agreement. One of the ways of dressing is the wrapping of the samma, which means that a man puts his garment over one of his shoulders so that one of his sides appears uncovered; the other is when a man wraps himself up in his garment while sitting in such a way that none of it covers his private parts. (Bukhari and Muslim.)

Abu Huraira said that God’s Messenger forbade a transaction determined by throwing stones1, and the type which involves some uncertainty2. Muslim transmitted it. 1. A type of transaction in which it is made binding when the buyer or the seller throws a stone; or in which a man agrees to sell to another all the commodities on which stones which he throws alight; or in which one agrees to sell another some land up to the distance to which he can throw a stone. 2. Bai' al-gharar. One might translate this ‘aleatory contracts of sale’, but this is not the only term to which that applies. The type of transaction intended is one in which there is no guarantee that the seller can deliver the goods for which he receives payment. It could include such items as selling a runaway slave, or fish which one has not caught, etc.

Ibn ‘Umar said that God's Messenger forbade the transaction called habal al-habala which was one entered into in pre-Islamic times, whereby a man bought a she-camel which was to be the offspring of a she-camel which was still in its mother’s womb. (Bukhari and Muslim.)

He said that God’s Messenger forbade [taking hire for] a stallion's covering. Bukhari transmitted it.

Jabir said that God’s Messenger forbade hiring a camel to cover a she-camel and selling water and land to be tilled (This is really mukhabara). Muslim transmitted it.

He said that God’s Messenger forbade the sale of excess water. Muslim transmitted it.