Jabir bin'Abdullah (RA) is reported to have said that Allah's Messenger ( صلی اللہ علیہ وسلم ) forbade the sale of a heap of dates the weight of which is unknown in accordance with the known weight of dates.

This hadith is narrated on the authority of Jabir bin'Abdullah (RA) but with this variation that no mention is made of the dates (which one finds) at the end of the previous hadith.

Ibn 'Umar (RA) reported Allah's Messenger ( صلی اللہ علیہ وسلم ) as saying: Both parties in a business transaction have the right to annul it so long as they have not separated; except in transactions which have been made subject to the right of parties to annul them.

Zuhair ibn Harb and Muhammad ibn al-Muthanna narrated to us, they said: Yahya, who is al-Qattan, narrated to us.
And Abu Bakr ibn Abi Shaybah narrated to us, Muhammad ibn Bishr narrated to us.
And Ibn Numayr narrated to us, my father narrated to us, all of them from Ubaydullah, from Nafi', from Ibn Umar, from the Prophet, peace and blessings be upon him.
And Zuhair ibn Harb and Ali ibn Hujr narrated to me, they said: Isma'il narrated to us.
And Abu al-Rabi' and Abu Kamil narrated to us, they said: Hammad, who is Ibn Zayd, narrated to us, all from Ayyub, from Nafi', from Ibn Umar, from the Prophet, peace and blessings be upon him.
And Ibn al-Muthanna and Ibn Abi 'Umar narrated to us, they said: Abdul Wahhab narrated to us, he said: I heard Yahya ibn Sa'id.
And Ibn Rafi' narrated to us, Ibn Abi Fudayk narrated to us, al-Dahhak informed us, both from Nafi', from Ibn Umar, from the Prophet, peace and blessings be upon him, similar to the hadith of Malik from Nafi'.

Ibn 'Umar (Allah be pleased with thcm) reported Allah's Messenger ( صلی اللہ علیہ وسلم ) as saying: When two persons enter into a transaction, each of them has the right to annul it so long as they are not separated and are together (at the place of transaction) ; or if one gives the other the right (to annul the transaction) But if one gives the other the option, the transaction is made on this condition (i. e. one has the right to annul the transaction), it becomes binding. And if they are separated after they have made the bargain and none of them annulled it, even then the transaction is binding.

Abdullah bin 'Umar (RA) reported Allah's Messenger ( صلی اللہ علیہ وسلم ) as saying: When two persons enter into a transac. tion, each one of them has the right to annul it so long as they are not separated, or their transaction gives one another (as a condition) the right of annulling, and if their transaction, has the right of annulling it the transaction becomes binding. Ibn Abi Umar made this addition that whenever he (Ibn 'Umar (RA)) entered into a transaction with a person with the intention of not breaking it, he walked a while and then returned to him.

Ibn 'Umar (RA) reported Allah's Messenger ( صلی اللہ علیہ وسلم ) as saying: There is no transaction between two persons entering a transaction until they separate, but only when there is an option to annul it.

Hakim bin Hazim (RA) reported Allah's Messenger ( صلی اللہ علیہ وسلم ) as saying: Both parties in a business transaction have the right to annul it so long as they have not separated; and if they speak the truth and make everything clear they will be blessed in their transaction; but if they tell a lie and conceal anything the blessing on their transaction will be blotted out.

A hadith like this has been transmitted on the authority of Hakim bin Hizam (Imam Muslim) said: Hakim bin Hizam was born inside the Ka’bah and lived for one hundred and twenty years.

Abdullah bin Dinar narrated that he heard Ibn 'Umar (RA) saying: A man mentioned to the Messenger of Allah ( صلی اللہ علیہ وسلم ) that he was deceived in a business transaction, whereupon Allah's Messenger ( صلی اللہ علیہ وسلم ) said: When you enter into a transaction, say: There should be no attempt to deceive.