What is the ruling on a binding contract of purchase if the sale is concluded, and is the sale valid or void, with the agreement of the one ordering the purchase to this binding clause?

An obligatory promise to purchase, if it leads the promisee to incur a burden, must be fulfilled unless there is a valid excuse. This is the view of the Maliki school and a group of scholars.

The International Islamic Fiqh Academy holds that the promise is religiously binding unless there is an excuse, and legally binding if it is contingent upon a cause and the promisee incurs a burden because of it. The effect of this obligation is either the fulfillment of the promise or compensation for the damage.

This does not affect the validity of the transaction if it is completed.