Chapter 2, Verse 283

O ye who believe! when you borrow one from another for a fixed period, then write it down. And let a scribe write it in your presence faithfully; and no scribe should refuse to write, because Allah has taught him, so let him write and let him who incurs the liability dictate; and he should fear Allah, his Lord, and not diminish anything therefrom. But if the person incurring the liability be of low understanding or be weak or be unable himself to dictate, then let someone who can watch his interest dictate with justice. And call two witnesses from among your men; and if two men be not available, then a man and two women, of such as you like as witnesses, so that if either of two women should err in memory, then one may remind the other. And the witnesses should not refuse when they are called. And do not feel weary of writing it down, whether it be small or large, along with its appointed time of payment. This is more equitable in the sight of Allah and makes testimony surer and is more likely to keep you away from doubts; therefore omit not to write except that it be ready merchandise which you give or take from hand to hand, in which case it shall be no sin for you that you write it not. And have witnesses when you sell one to another; and let no harm be done to the scribe or the witness. And if you do that, then certainly it shall be disobedience on your part. And fear Allah. And Allah grants you knowledge and Allah knows all things well.