Abu Huraira reported Allah's Messenger ﷺ as saying, “When a Muslim, or a believer, washes his face in the course of ablution, every sin he contemplated with his eyes will come forth from his face along with the water, or with the last drop of water; when he washes his hands, every sin they wrought will come forth from his hands with the water, or with the last drop of water; and when he washes his feet, every sin towards which his feet have walked will come out with the water, or with the last drop of water, with the result that he will come forth pure from offences.” Muslim transmitted it.

He reported Allah's Messenger ﷺ 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 Allah's Messenger ﷺ as saying, “A man must not offer a price above that offered by his brother Muslim.” Muslim transmitted it.

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

Abu Sa'id al-Khudri said that Allah's Messenger ﷺ 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 Allah's Messenger ﷺ 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 Allah's Messenger ﷺ 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 Allah's Messenger ﷺ forbade [taking hire for] a stallion's covering. Bukhari transmitted it.

Jabir said that Allah's Messenger ﷺ 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 Allah's Messenger ﷺ forbade the sale of excess water. Muslim transmitted it.

Abu Huraira reported Allah's Messenger ﷺ as saying, “Excess water must not be sold for the purpose of having the herbage which grows from it sold." (Bukhari and Muslim.)