Is paying the difference to a bank on a loan considered a major or minor sin, and does the one who pays the difference fall under the threat of "Allah's curse be upon the one who consumes usury and the one who feeds it," similar to other issues concerning which a curse was mentioned and about which there was disagreement among jurists?

Scholars are of the view that the pronouncement of a curse upon an act renders it forbidden (haram (definition)) and elevates it from the category of minor sins to major sins. However, they may differ in the application of the text, either because the hadith (definition) does not encompass the specific case, or because the evidence has not reached some of them.

There is no scholar who claims that a curse does not signify prohibition. Therefore, giving interest (usury) is forbidden because it is a means to consuming usury. It has been authentically reported that the Messenger of Allah, peace and blessings be upon him, cursed the consumer of usury and its giver. This means that borrowing with stipulated interest is the forbidden usury.