“O ye who believe! Fear Allah, and give up what remains of your demand for usury (i.e., the interest due on a fixed deposit, or on any other loan on interest), if ye are indeed believers.”  If ye do it not (i.e. if you persist in your claim or demand for the interest due to you), then take notice of (a declaration of) war from Allah and His Messenger: but if ye turn away (from such claim or demand), then you are entitled to the return of your capital sum (placed in the fixed deposit or otherwise lent); do not enter into (such) unjust transactions, nor allow yourselves to be subjected to such.

If (you forgo the interest due to you and then find) the debtor in a difficulty (in respect of returning the capital sum that was lent to him on interest), grant him time till it is easy for him to repay. But if ye remit it by way of charity, that is best for you if ye only knew.

And (in this matter in particular, i.e., lending money on interest) fear the Day when ye shall be brought back to Allah. Then shall every soul be paid what it earned, and none shall be dealt with unjustly.’ (Qur’an, al-Baqarah, 2:278-281)