Kuwait Court of Cassation principle number 3508

Entitlement to default interest, whether statutory or agreed, is conditional upon the debt whose payment the debtor delayed arising from a commercial obligation or a commercial act. A civil obligation. No default interest is due thereon. - The consequences thereof. - An example concerning a claim for equivalent performance as a civil debt. Its effect. Claiming interest thereon is prohibited, and every agreement thereon is void. This relates to public policy. A judgment contravening this. It must be quashed for violation of the law. An example concerning a claim for equivalent performance originating in unjust enrichment. - Obligations of the seller and buyer:-