Abu Huraira (Allah be pleased with him) reported that Allah's Messenger (may peace be upon him) forbade the (people) meeting the caravan (for entering into business transaction with them), and the selling of goods by a townsman on behalf of a man of the desert, and seeking by a woman the divorce of her sister (from her husband), and outbidding (against one another), and tying up the udders (of animals), and buying of (things) in opposition to one's brother.

They (the people) used to buy grain in the upper part of the market in the same spot without measuring or weighing it. The Messenger of Allah (saws) forbade them to sell it there before removing it.

That a bedouin told him that he brought a milch she-camel in the time of the Messenger of Allah (saws). He alighted with Talhah ibn Ubaydullah (and wanted to sell his milch animal to him). He said: The Prophet (saws) forbade a townsman to sell for a man from the desert. But go to the market and see who buys from you. consult me thereafter, and then I shall ask you (to sell) or forbid you.

Ibn `Umar told us that the people used to buy food from the caravans in the lifetime of the Prophet. The Prophet used to forbid them to sell it at the very place where they had purchased it (but they were to wait) till they carried it to the market where foodstuff was sold. Ibn `Umar said, 'The Prophet also forbade the reselling of foodstuff by somebody who had bought it unless he had received it with exact full measure.'

Yahya related to me from Malik from Nafi from Abdullah ibn Umar that some men from Iraq said to him, "Abu Abd ar-Rahman, we buy the fruit of the palm and grapes and we squeeze them into wine and we sell it." Abdullah ibn Umar said, "I call on Allah and His angels and whoever hears of jinn and men to testify to you that I order you not to buy it nor sell it nor to press it nor to drink it nor to give it to people to drink. It is something impure from the work of Shaytan."

Aisha wanted to buy Barirah and he (the Prophet) went out for the prayer. When he returned, she told him that they (her masters) refused to sell her except on the condition that her Wala' would go to them. The Prophet replied, 'The Wala' would go to him who manumits.' " Hammam asked Nafi` whether her (Barirah's) husband was a free man or a slave. He replied that he did not know.

Barirah went to Aisha, the mother of the faithful believers to seek her help in her emancipation Aisha said to her, "If your masters agree, I will pay them your price in a lump sum and manumit (free) you." Barirah mentioned that offer to her masters but they refused to sell her unless the Wala' was for them. `Aisha told Allah's Apostle about it. He said, "Buy and manumit her as the Wala' is for the liberator."

The Messenger of Allah (saws) prohibited buying and selling in the mosque, announcing aloud about a lost thing, the recitation of a poem in it, and prohibited sitting in a circle (in the mosque) on Friday before the prayer.

He said: There are narrations on this topic from 'Abdullah bin 'Umar.

The Prophet said, "The neighbor has more right to be taken care of by his neighbor (than anyone else)." Some men said, "If one wants to buy a house for 20,000 Dirhams then there is no harm to play a trick to deprive somebody of preemption by buying it (just on paper) with 20,000 Dirhams but paying to the seller only 9,999 Dirhams in cash and then agree with the seller to pay only one Dinar in cash for the rest of the price (i.e. 10,001 Dirhams). If the preemptor offers 20,000 Dirhams for the house, he can buy it otherwise he has no right to buy it (by this trick he got out of preemption). If the house proves to belong to somebody else other than the seller, the buyer should take back from the seller what he has paid, i.e., 9,999 Dirhams and one Dinar, because if the house proves to belong to somebody else, so the whole bargain (deal) is unlawful. If the buyer finds a defect in the house and it does not belong to somebody other than the seller, the buyer may return it and receive 20,000 Dirhams (instead of 9999 Dirham plus one Dinar) which he actually paid.' Abu `Abdullah said, "So that man allows (some people) the playing of tricks amongst the Muslims (although) the Prophet said, 'In dealing with Muslims one should not sell them sick (animals) or bad things or stolen things."

Allah's Apostle appointed somebody as a governor of Khaibar. That governor brought to him an excellent kind of dates (from Khaibar). The Prophet asked, "Are all the dates of Khaibar like this?" He replied, "By Allah, no, O Allah's Apostle! But we barter one Sa of this (type of dates) for two Sas of dates of ours and two Sas of it for three of ours." Allah's Apostle said, "Do not do so (as that is a kind of usury) but sell the mixed dates (of inferior quality) for money, and then buy good dates with that money."

The Prophet said, "No town-dweller should sell for a bedouin. Do not practice Najsh (i.e. Do not offer a high price for a thing which you do not want to buy, in order to deceive the people). No Muslim should offer more for a thing already bought by his Muslim brother, nor should he demand the hand of a girl already engaged to another Muslim. A Muslim woman shall not try to bring about The divorce of her sister (i.e. another Muslim woman) in order to take her place herself."

Allah's Apostle appointed a man as the ruler of Khaibar who later brought some Janib (i.e. dates of good quality) to the Prophet. On that, Allah's Apostle said (to him). "Are all the dates of Khaibar like this?" He said, "No, by Allah, O Allah's Apostle! But we take one Sa of these (dates of good quality) for two or three Sa's of other dates (of inferior quality)." On that, Allah's Apostle said, "Do not do so, but first sell the inferior quality dates for money and then with that money, buy Janib."

Moosa bin Wardan narrated from Sa`eed bin al-Musayyab from ‘Uthman bin `Affan (رضي الله عنه)... and he mentioned a similar report.

Ubaydullah ibn Salman reported on the authority of a man from the Companions of the Prophet (saws): When we conquered Khaybar, they (the people) took out their spoils which contained equipment and captives. The people began to buy and sell their spoils. When the Messenger of Allah (saws) prayed, a man came to him and said: Messenger of Allah, I have gained today so much so that no one gained from this valley. He asked: Woe unto you, how much did you gain? He replied: I kept on selling and buying until I gained three hundred uqiyahs. The Messenger of Allah (saws) said: I tell you a man who gained better than you. He asked: What is that, Messenger of Allah? He replied! Two rak'ahs (of supererogatory prayer) after the (obligatory) prayer.

Malik related to me from Yahya ibn Said that he heard Muhammad ibn al-Munkadir say, "Allah loves his slave who is generous when he sells, and generous when he buys, generous when he repays, and generous when he is repaid."

Malik said about a man who bought camels or sheep or dry goods or slaves or any goods without measuring precisely, "There is no buying without measuring precisely in anything which can be counted . "

Malik said about a man who gave a man goods to sell for him and set their price saying, "If you sell them for this price as I have ordered you to do, you will have a dinar (or something which he has specified, which they are both satisfied with), if you do not sell them, you will have nothing," "There is no harm in that when he names a price to sell them at and names a known fee. If he sells the goods, he takes the fee, and if he does not sell them, he has nothing."

Malik said, "This is like saying to another man, 'If you capture my runaway slave or bring my stray camel, you will have such-and-such.' This is from the category of reward, and not from the category of giving a wage. Had it been from the category of giving a wage, it would not be good."

Malik said, "As for a man who is given goods and told that if he sells them he will have a named percentage for every dinar, that is not good because whenever he is a dinar less than the price of the goods, he decreases the due which was named for him. This is an uncertain transaction. He does not know how much he will be given."

Yahya related to me from Malik that Abu'z-Zinad heard Sa'id ibn al-Musayyab andSulayman ibn Yasar forbid a man to sell wheat for gold on delayed terms and then to buy dried dates with the gold before he had taken delivery of the gold.