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"O you who believe! When you contract a debt for a fixed period, write it down, Let a scribe write it down in justice between you, Let not the scribe refuse to write as Allaah has taught him, so let him write, Let him (the debtor) who incurs the liability dictate, and he must fear Allaah, his Lord, and diminish not anything of what he owes, But if the debtor is of poor understanding, or weak, or is unable himself to dictate, then let his guardian dictate in justice, And get two witnesses out of your own men, And if there are not two men (available), then a man and two women, such as you agree for witnesses, so that if one of them (two women) errs, the other can remind her, And the witnesses should not refuse when they are called on (for evidence), You should not become weary to write it (your contract), whether it be small or big, for its fixed term, that is more just with Allaah; more solid as evidence, and more convenient to prevent doubts among yourselves, save when it is a present trade which you carry out on the spot among yourselves, then there is no sin on you if you do not write it down, But take witnesses whenever you make a commercial contract, Let neither scribe nor witness suffer any harm, but if you do (such harm), it would be wickedness in you, So be afraid of Allaah; and Allaah teaches you, And Allaah is the All-Knower of each and everything." [Al-Baqarah (2):282]

Narrated Anas bin Malik:

The Prophet said, "Facilitate things to people (concerning religious matters), and do not make it hard for them and give them good tidings and do not make them run away (from Islam)." [The Book of Knowledge Volume 1, Book 3, Hadeeth 69]