Sahih Bukhari

from Malik bin Aus, that the latter said, "Who has change?" Talha said, "I (will have change) when our store-keeper comes from the forest." Narrated Umar bin Al-Khattab: Allah's Apostle said, "The bartering of gold for silver is Riba, (usury), except if it is from hand to hand and equal in amount, and wheat grain for wheat grain is usury except if it is form hand to hand and equal in amount, and dates for dates is usury except if it is from hand to hand and equal in amount, and barley for barley is usury except if it is from hand to hand and equal in amount." (See Riba-Fadl in the glossary).
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The Prophet forbade the selling of foodstuff before receiving it. I consider that all types of sellings should be done similarly.
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The Prophet said, "The buyer of foodstuff should not sell it before it has been measured for him." Isma'il narrated instead, "He should not sell it before receiving it."
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I saw the people buy foodstuff randomly (i.e. blindly without measuring it) in the life-time of Allah's Apostle and they were punished (by beating), if they tried to sell it before carrying it to their own houses.
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Rarely did the Prophet (saw) fail to visit Abu Bakr's house everyday, either in the morning or in the evening. When the permission for migration to Madina was granted, all of a sudden the Prophet (saw) came to us at noon and Abu Bakr was informed, who said, "Certainly the Prophet has come for some urgent matter." The Prophet (saw) said to Abu Bakr, when the latter entered "Let nobody stay in your home." Abu Bakr said, "O Allah's Apostle! (saw) There are only my two daughters (namely Aisha and Asma) present." The Prophet (saw) said, "I feel (am informed) that I have been granted the permission for migration." Abu Bakr said, "I will accompany you, O Allah's Apostle! (saw)" The Prophet (saw) said, "You will accompany me." Abu Bakr then said "O Allah's Apostle! (saw) I have two she-camels I have prepared specially for migration, so I offer you one of them. The Prophet (saw) said, "I have accepted it on the condition that I will pay its price."
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Allah's Apostle said, "Do not urge somebody to return what he has already bought (i.e. in optional sale) from another seller so as to sell him your own goods."
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Allah's Apostle forbade the selling of things by a town dweller on behalf of a desert dweller; and similarly Najsh was forbidden. And one should not urge somebody to return the goods to the seller so as to sell him his own goods; nor should one demand the hand of a girl who has already been engaged to someone else; and a woman should not try to cause some other woman to be divorced in order to take her place.
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A man decided that a slave of his would be manumitted after his death and later on he was in need of money, so the Prophet took the slave and said, "Who will buy this slave from me?" Nuaim bin Abdullah bought him for such and such price and the Prophet gave him the slave.
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Allah's Apostle forbade Najsh.
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Allah's Apostle forbade the sale called Habal-al-Habala which was a kind of sale practiced in the Pre-lslamic Period of ignorance. One would pay the price of a she-camel which was not born yet would be born by the immediate offspring of an extant she-camel.
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