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fa-ʾin lam tafʿalū fa-ʾdhanū bi-ḥarbin mina llāhi wa-rasūlihī wa-ʾin tubtum fa-lakum ruʾūsu ʾamwālikum lā taẓlimūna wa-lā tuẓlamūna
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.
— Ali Quli Qarai
Surah Al-Baqarah, Verse 279
279. "But if you do (it) not, then be you apprised for war from Allah and (His Apostle, and if you repent, you shall have your capital; (thus) deal you not unjustly (with others), nor you be dealt with unjustly."
In Islam, neither usury nor taking undue gains are allowed nor can the property of people be confiscated unilaterally. In some governmental regulations, ownership is abrogated and all properties are forcefully taken from their possessors. In some other ones exploitation, devouring other's rights, and usury, in any form, is free.
Explanations
1. Usurer is a fighter against Allah. Any usurer would know that, in this battlefield, he (who is a feeble and contemptible mortal) is on one side, and Allah, the Almighty, is on the other side.
2. Since usurer is a fighter against Allah, it is to the Islamic Government, as a duty, to take action against usurers.
3. The right of usurer is to be content with only the capital, without any interest.
4. Both being oppressor and oppressive are condemned. Neither accept oppression nor be an oppressor.
5. Beware not to spare the principle of ownership of people for rescuing the deprived.