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  • AlGhazalisIhya-Book_of_Ethics_of_Earning_a_Livelihood, page : 9

Eighth: The goods are not to be defined as originating from a specific place.

Ninth: The goods are not to be defined as being contained in specific container
of a type, which is impossible to find.

Tenth: It should not be delivered in food, even if the capital was food, nor be
handed in cash even if the capital was cash.

Fourth: Rental Contract

There are two pillars: the rent and the benefit.

Rent is the value of money; it should be known and specified with all its
conditions as in a contract for sale.

The second pillar: The benefit intended from the rental there are five conditions
pertaining to it:

First: There should be work or effort exerted for rent.