Transaction is void in several cases:
I. To sale and purchase of original Nejasat
like intoxicating beverages, non-hunting dogs, pigs, an unslaughtered
carcass (as a precaution). Besides, if a permissible use of Najisul Ayn is
possible, like, excrement and faces being converted to manure or
fertilizers, its transaction is permitted. Also, transaction on blood
which is necessary in out time for saving wounded and sick people.
II. Sale and purchase of usurped property,
unless the owner permits.
III. As a precaution, it is Haraam to sell
and purchase those things, which are not usually considered to be
merchandise, like, the sale and purchase of wild beasts.
IV. Sale and purchase of those things, which
are usually utilized for Haraam acts only, like gambling tools, and
musical instruments. A transaction which involves fraud or adulteration is
Haraam, like, when one commodity is mixed with another, and it is not
possible to detect the adulteration, nor does the seller inform the buyer
about it, like, to sell ghee mixed with fat. The Holy Prophet of Islam
(SWA) said: If a person makes a deceitful transaction with the Muslims,
or puts them to a loss, or cheats them, he is not one of my followers. And
when a person cheats his fellow Muslim, Allah deprives him of Blessings in
his livelihood, closes the means of his earning, and leaves him to
V. Any transaction which involves interest.
2158. It is permitted to sell a Pak thing which was Najis before and has been made Pak by washing it. But if a customer wants to eat it, seller should inform him about previous Najis state. But in case of clothes it is not necessary to inform him, even if the customer prays with those clothes because apparent cleanness of clothes and body is enough for offering prayers.
2159. If something like oils which cant be washed with water get Najis, if the Najis oil is given to a buyer for eating, the transaction is void and Haraam, but it is given for a purpose which does not require to be Pak, for example they want to burn Najis oil or turn it to soap, it is in order.
2160. Although the purchase and sale of Najis medicines is permissible, the buyer should be informed about it in situation.
2161. There is no objection to selling or buying the oils and liquid medicine and perfumes, which are imported from non-Islamic countries, if is not known to be Najis. And as for the fat, which is obtained from a dead animal, if there is a probability that it belongs to an animal which has been slaughtered according to Islamic law, it will be deemed Pak, and its sale and purchase will be permissible, even if it is acquired from a non-Muslim or is a imported from non-Islamic countries. But it is Haraam to eat it, and it is necessary for the seller to inform the buyer about the situation, so that he does not commit anything contrary to his religious responsibility.
2162. If a fox, is not slaughtered according to religious law, or dies a natural death, it is Haraam to purchase or sell its hide, and transaction is void.
2163. The purchase and sale of meat, fat, hide and skin which is imported from a non-Islamic country, or is bought from a non-Muslim, is permissible provided that one feels strongly that the animal was most probably slaughtered according to Islamic law. But, Namaz with it will not be in order.
2164. Sale and purchase of fat, and the hide obtained from a Muslim, when one knows that the Muslim has obtained it from a non-Muslim, without investigating whether or not the animal has been slaughtered according to Islamic law, is permissible. But it is not permissible to eat it, or offer prayer with them.
2165. Transaction of intoxicating drinks is Haraam and void.
2166. Sale of usurped property is void if the owner rejects it, and the seller should return to the buyer the money taken from him.
2167. If a buyers intention is not to pay the price of the commodity being purchased by him, the transaction has Ishkal.
2168. If a person has purchased a commodity on credit, and wishes to pay its price later from his Haraam earning or wealth, the transaction will not be valid, but, he will have to pay the amount which he owes from Halal property, in order to be absolved of his responsibility, if his intention was not as above case originally.
2169. Purchase and sale of instruments of entertainment like, guitar and lute, is Haraam.
2170. If a thing which can be used for Halal purposes is sold with the intention of putting it to Haraam use - for example, if grapes are sold so that wine may be prepared with them, the transaction is Haraam, and as a precaution the deal is void.
2171. Buying and selling sculptures and things, which have sculptures, is in order.
2172. It is Haraam to purchase a thing, which has been acquired by means of gambling, theft, or a void transaction, and it a person buys such a thing from a seller, he should return it to its original owner.
2173. If a person sells Ghee mixed with fat, if he specifies it, for example he says: I am selling one man (3 kg.) of Ghee, the purchase can cancel the transaction, but if he does not specify but simply sells one Man of Ghee and give a Ghee, which is mixed with fat, the purchaser can return it and ask for pure Ghee.