And if it is required for a purpose for which its purity is not a pre-requisite...

And if it is required for a purpose for which its purity is not a pre-requisite, for example if impure oil is to be used for burning, but it is possible that the food or body of the buyer may become impure with it, even then the same rule applies and it is necessary for the seller to inform the buyer about the impurity of the commodity because it is not permissible to become the cause of the impurity of food or of the impurity of body which becomes the cause of nullification of ablutions or bath becoming void.

2066.Although the purchase and sale of eatable impure medicines is permissible, the buyer should be informed about it. And the same rule applies when the medicine is not eatable but there is a possibility of its contaminating the food or body of the buyer. 2067. There is no harm in selling or buying the oils which are imported from non-Islamic countries, if nothing is known about their being impure.

And as regards the fat which is obtained from an animal after its death, in case it is probable that it is of an animal, which has been slaughtered according to Islamic law and it is obtained from an unbeliever, or is imported from non-Islamic countries, though it is pure and its purchase and sale is permissible, it is unlawful to eat it, and it is necessary for the seller to inform the buyer about it. 2068.

If a fox, or any other such animal is not slaughtered according to religious law, or dies. it is unlawful to purchase or sell its hide, and its transaction is void. 2069. The purchase and sale of a hide which is imported from a non-Islamic country or is received from an unbeliever is permissible if it is probable that it is of an animal which has been slaughtered according to Islamic law. However, it is not permissible to use it in offering prayers. 2070.

It is permissible to purchase and sell the fat which is obtained from an animal after its death, and the hide, which is obtained from a Muslim and one knows that Muslim has obtained it from an unbeliever and has not verified whether or not it is of an animal, which has been slaughtered according to Islamic law. However, offering prayers with that hide, or eating that fat is not permissible. 2071. Transaction of intoxicating drinks is unlawful and void. 2072.

Sale of usurped property is void and the seller should return to the buyer the money taken from him. 2073.

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