Tafsir of Al-Baqarah 2:279

فٳن لم تفعلوا فٲذنوا بحرب من الله ورسوله

O you who believe! Be afraid of Allah and give up what remains (due to you) from Riba (from now onward), if you are (really) believers. And if you do not do it, then take a notice of war from Allah and His Messenger. They said, "We repent to Allah and abandon whatever is left of our Riba'', and they all abandoned it. This Ayah serves as a stern threat to those who continue to deal in Riba after Allah revealed this warning. Riba Constitutes War Against Allah and His Messenger Ibn Jurayj said that Ibn Abbas said that,

فٲذنوا بحرب

(then take a notice of war) means, "Be sure of a war from Allah and His Messenger.'' He also said, "On the Day of Resurrection, those who eat Riba will be told, `take up arms for war.''' He then recited,

فٳن لم تفعلوا فٲذنوا بحرب من الله ورسوله

(And if you do not do it, then take a notice of war from Allah and His Messenger). Ali bin Abi Talhah said that Ibn Abbas said about,

فٳن لم تفعلوا فٲذنوا بحرب من الله ورسوله

(And if you do not do it, then take a notice of war from Allah and His Messenger), "Whoever kept dealing with Riba and did not refrain from it, then the Muslim Leader should require him to repent. If he still did not refrain from Riba, the Muslim Leader should cut off his head.'' Allah then said,

وإن تبتم فلكم رووس أموالكم ﻻ تظلمون

But if you repent, you shall have your capital sums. Deal not unjustly, by taking the Riba,

وﻻ تظلمون

And you shall not be dealt with unjustly. meaning, your original capital will not diminish. Rather, you will receive only what you lent without increase or decrease. Ibn Abi Hatim recorded that Amr bin Al-Ahwas said, "The Messenger of Allah gave a speech during the Farewell Hajj saying;

أﻻ إن كل ربا كان في الجاهلية موضوع عنكم كله لكم رووس أموالكم ﻻ تظلمون وﻻتظلمون وأول ربا موضوع ربا العباس بن عبدالمطلب موضوع كله

Verily, every case of Riba from the Jahiliyyah is completely annulled. You will only take back your capital, without increase or decrease. The first Riba that I annul is the Riba of Al-Abbas bin Abdul-Muttalib, all of it is annulled. Being Kind to Debtors Who Face Financial Difficulties Allah said,

وإن كان ذو عسرة فنظرة إلى ميسرة وأن تصدقوا خير لكم إن كنتم تعلمون