Abu Huraira reported Allah's Messenger ﷺ as saying, "Knowledge from which no benefit is derived is like a treasure from which nothing is expended in Allah’s path.” Darimi transmitted it.

Ibn 'Umar reported Allah's Messenger ﷺ as saying, "Both parties in a business transaction have a right to annul it so long as they have not separated, except in transactions which have been made subject to the right of the parties to annul them.” The version by Bukhari and Muslim has "or one of them tells the other to exercise his right” instead of "or exercise the right.” (Bukhari and Muslim.) A version by Muslim says, "Both parties in a business transaction have a right to annul the bargain so long as they have not separated, or when their bargain has attached to it the right to annul it, for when such a condition has been made it remains valid.” A version by Tirmidhi says, "The two parties in a business transaction have a right to annul it so long as they have not separated, or exercise the right.”

Hakim b. Hizam reported Allah's Messenger ﷺ as saying, "Both parties in a business transaction have a right to annul it so long as they have not separated ; and if they tell the truth and make everything clear they will be blessed in their transaction, but if they conceal anything and lie the blessing on their transaction will be blotted out.” (Bukhari and Muslim.)

Ibn ‘Umar said that a man told the Prophet (ﷺ) that he was being deceived in business transactions, and he replied, "When you make a bargain say, 'There is no attempt to deceive'*.” Then the man made a habit of saying that. (Bukhari and Muslim.) * He was to say this to protect himself because he was not expert enough to detect defects in what he was buying. Some hold that one who says this has the right to cancel the transaction if any defect is discovered within three days. Some say this applied only to the man who spoke to the Prophet; others say it applies to anyone.

'Amr b. Shu'aib, on his father's authority, said that his grandfather reported Allah's Messenger ﷺ as saying, “Both parties in a business transaction have a right to annul it so long as they have not separated unless it is a bargain with the right to annul it attached to it; and one has not the right to separate from the other for fear that he may demand that the bargain be rescinded.” Tirmidhi, Abu Dawud and Nasa’i transmitted it.

Abu Huraira reported the Prophet (ﷺ) as saying, “Two people must separate only by mutual consent.” Abu Dawud transmitted it.

Jabir told that Allah's Messenger ﷺ gave a desert Arab the right to rescind a bargain after having made it. Tirmidhi transmitted it, saying this is a hasan sahih gharib tradition.

Jabir said that Allah's Messenger ﷺ cursed the one who accepted usury, the one who paid it, the one who recorded it, and the two witnesses to it, saying they were all alike. Muslim transmitted it.

‘Ubada b. as-Samit reported Allah's Messenger ﷺ as saying, "Gold is to be paid for by gold, silver by silver, wheat by wheat, barley by barley, dates by dates, and salt by salt, like for like and equal for equal, payment being made on the spot. If these classes differ, sell as you wish if payment is made on the spot.” Muslim transmitted it.

Abu Sa'id al-Khudri reported Allah's Messenger ﷺ as saying, "Gold is to be paid for by gold, silver by silver, wheat by wheat, barley by barley, dates by dates, and salt by salt, like for like, payment being made on the spot. If anyone gives more or asks more he has dealt in usury. The receiver and the giver are equally guilty.” Muslim transmitted it.