فَإِن لَّمْ تَفْعَلُوا فَأْذَنُوا بِحَرْبٍ مِّنَ اللَّهِ وَرَسُولِهِ وَإِن تُبْتُمْ فَلَكُمْ رُءُوسُ أَمْوَالِكُمْ لَا تَظْلِمُونَ وَلَا تُظْلَمُونَ
And if you do not, then be informed of a war from Allah and His apostle. And if you repent, then you will have your principal, neither harming others, nor suffering harm.
Agha Ali Puya Commentary
Commentary on Quran 2:279
[Pooya/Ali Commentary 2:279] There is no neutral standing space between good and bad actions. If the faithful do not desist from usury, they will bear the consequences of making war against Allah and His messenger. Fadhanu means "be warned of" a war from Allah and His messenger. Imam Ali ibna abi Talib says: The Holy Prophet not only cursed the giver, the receiver, and the consumer of the usury but also condemned those who write and witness the transaction of usury.