Hakim b. Hizam reported God’s Messenger 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.”
Ibn 'Umar reported God's Messenger 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.”
Ibn ‘Umar said that a man told the Prophet 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.
‘Ubaid b. Rifa'a on his father’s authority reported the Prophet as saying, "The merchants will be raised up on the day of resurrection as evildoers, except those who fear God, are honest and speak the truth.”
Tirmidhi, Ibn Majah and Darimi transmitted it, and Baihaqi transmitted it in Shu'ab al-iman on the authority of al-Bara’. Tirmidhi said this is a hasan sahih tradition.
