Answer:

….disdain not to reduce to writing (your contract) for a future period, whether it be small or big: it is more just in the sight of Allah, More suitable as evidence, and more convenient to prevent doubts among yourselves but if it be a transaction which you carry out on the spot among yourselves, there is no blame on you if you reduce it not to writing. But take witness whenever you make a commercial contract; and let neither scribe nor witness suffer harm. If you do (such harm), it would be wickedness in you. So fear Allah. For it is Good that teaches you. And Allah is well acquainted with all things… (2:282)

Answer:

……..two men among you should act as witnesses. But if there are not two men, then a man and two women with whom you are satisfied as witnesses; then if one of them forgets, the other can remind her. Witnesses should not refuse when they are called upon….. (2:282)

Answer:

….If you are on a journey, and cannot find a scribe, a pledge with possession (may serve the purpose). And if one of you deposits a thing on trust with another, let the trustee (faithfully) discharge his trust, and let him Fear his Lord conceal not evidence; for whoever conceals it, – his heart is tainted with sin. And Allah knoweth all that you do. (2:283)