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AlGhazalisIhya-Book_of_Ethics_of_Earning_a_Livelihood, page : 5
Firstly, it should not be impure, it is not permitted to sell dogs or pigs.
Secondly, it should be of benefit, so it is not permitted to sell insects, rats or
snakes.
But you may sell parrots, peacocks and all decorative birds, even if they are
inedible, to enjoy the sight and sound of them is permissible, but the dog is a
thing, which cannot be kept in the house for amusement, because the Prophet,
praise and peace be upon him, has forbidden us from doing so.
Thirdly, the goods should belong to the contractor or he has permission from the
owner to sell them.
Fourthly, the goods must be physical and available, whatever cannot be
physically handed from one to another cannot be sold, such as fish in the sea,
unborn cattle and the fleece upon the sheep, nor the milk in the udder. Anything,
which cannot be lawfully handed over, such as mortgaged property or frozen
assets, cannot be sold.
Secondly, it should be of benefit, so it is not permitted to sell insects, rats or
snakes.
But you may sell parrots, peacocks and all decorative birds, even if they are
inedible, to enjoy the sight and sound of them is permissible, but the dog is a
thing, which cannot be kept in the house for amusement, because the Prophet,
praise and peace be upon him, has forbidden us from doing so.
Thirdly, the goods should belong to the contractor or he has permission from the
owner to sell them.
Fourthly, the goods must be physical and available, whatever cannot be
physically handed from one to another cannot be sold, such as fish in the sea,
unborn cattle and the fleece upon the sheep, nor the milk in the udder. Anything,
which cannot be lawfully handed over, such as mortgaged property or frozen
assets, cannot be sold.