The Ruling on Pledging Benefits

Question : It is not permissible to pledge benefits, because they are consumed until the right is due. Even if he pledged it for the rent of his house for one month, it would not be valid, because it is unknown. As for the one who says that it is valid to pledge benefits, because it is permissible to contract for compensation on them, so the pledged item is rented out and its rent is made a pledge, as for his statement that if he pledged it for the rent of his house for one month it would not be valid, there is also consideration in that, because the common case is that the rent is known, and if it is unknown, it is as we said previously that pledging the unknown is valid.

Answer : It is valid to pledge benefits, because it is permissible to contract for compensation on them, so the pledged item is rented out and its rent is made a pledge. As for his statement that if he pledged it for the rent of his house for one month it would not be valid, there is also consideration in that, because the common case is that the rent is known, and if it is unknown, it is as we said previously that pledging the unknown is valid.