Malik said,An inheritor or someone else who sells a slave or slave-girl without any such built-in guarantee is not responsible for any fault in the slave and there is no liability agreement held against him unless he was aware of a fault and concealed it. If he was aware of a fault, the lack of guarantee does not protect him. The purchase is returned. In our view, built-in liability agreements only apply to the purchase of slaves.

Malik said, There is no harm in buying gold with silver or silver with gold without measuring if it is unminted or a piece of jewellery which has been made. Counted dirhams and counted dinars should not be bought without reckoning until they are known and counted. To abandon number and buy them at random would only be to speculate. That is not part of the business transactions of Muslims. As for what is weighed of unminted objects and jewellery, there is no harm in buying such things without measuring. To buy them without measuring is like buying wheat, dried dates, and such food-stuffs, which are sold without measuring, even though things like them are measured

Malik spoke about buying a Qur'an, a sword or a signet ring which had some gold or silver work on it with dinars or dirhams. He said, The value of the object bought with dinars, which has gold in it is looked at. If the value of the gold is up to one-third of the price, it is permitted and there is no harm in it if the sale is hand to hand and there is no deferment in it. When something is bought with silver which has silver in it, the value is looked at. If the value of the silver is one-third, it is permitted and there is no harm in it if the sale is hand to hand. That is still the way of doing things among us.

Malik said, When a man buys dirhams with dinars and then finds a bad dirham among them and wants to return it, the exchange of the dinars breaks down, and he returns the silver and takes back his dinars. The explanation of what is disapproved of in that is that the Messenger of Allah, may Allah bless him and grant him peace, said, 'Gold for silver is usury except hand to hand.' and Umar ibn al-Khattab said, 'If someone asks you to wait to be paid until he has gone back to his house, do not leave him.' When he returns a dirham to him from the exchange after he has left him, it is like a debt or something deferred. For that reason, it is disapproved of, and the exchange collapses. Umar ibn al-Khattab wanted that all gold, silver and food should not be sold for goods to be paid later. He did not want there to be any delay or deferment in any such sale, whether it involved one commodity or different sorts of commodities.