O you who believe, when you contract a debt for a fixed time, write it down. And let a scribe write it down between you with fairness; nor should the scribe refuse to write as Allah has taught him, so let him write. And let him who owes the debt dictate, and he should observe his duty to Allah, his Lord, and not diminish any thing from it. But if he who owes the debt is unsound in understanding or weak, or (if) he is not able to dictate himself, let his guardian dictate with fairness. And call to witness from among your men two witnesses; but if there are not two men, then one man and two women from among those whom you choose to be witnesses, so that if one of the two errs, the one may remind the other. And the witnesses must not refuse when they are summoned. And be not averse to writing it whether it is small or large along with the time of its falling due. This is more equitable in the sight of Allah and makes testimony surer and the best way to keep away from doubts. But when it is ready merchandise which you give and take among yourselves from hand to hand, there is no blame on you in not writing it down. And have witnesses when you sell one to another. And let no harm be done to the scribe or to the witnesses. And if you do (it), then surely it is a transgression on your part. And keep your duty to Allah. And Allah teaches you. And Allah is Knower of all things.