Transactions involving future obligations reduce them to writing.....

يَـٰٓأَيُّهَا ٱلَّذِينَ ءَامَنُوٓاْ إِذَا تَدَايَنتُم بِدَيۡنٍ إِلَىٰٓ أَجَلٍ۬ مُّسَمًّ۬ى فَٱڪۡتُبُوهُ‌ۚ وَلۡيَكۡتُب بَّيۡنَكُمۡ ڪَاتِبُۢ بِٱلۡعَدۡلِ‌ۚ وَلَا يَأۡبَ كَاتِبٌ أَن يَكۡتُبَ ڪَمَا عَلَّمَهُ ٱللَّهُ‌ۚ فَلۡيَڪۡتُبۡ وَلۡيُمۡلِلِ ٱلَّذِى عَلَيۡهِ ٱلۡحَقُّ وَلۡيَتَّقِ ٱللَّهَ رَبَّهُ ۥ وَلَا يَبۡخَسۡ مِنۡهُ شَيۡـًٔ۬ا‌ۚ فَإِن كَانَ ٱلَّذِى عَلَيۡهِ ٱلۡحَقُّ سَفِيهًا أَوۡ ضَعِيفًا أَوۡ لَا يَسۡتَطِيعُ أَن يُمِلَّ هُوَ فَلۡيُمۡلِلۡ وَلِيُّهُ ۥ بِٱلۡعَدۡلِ‌ۚ وَٱسۡتَشۡہِدُواْ شَہِيدَيۡنِ مِن رِّجَالِڪُمۡ‌ۖ فَإِن لَّمۡ يَكُونَا رَجُلَيۡنِ فَرَجُلٌ۬ وَٱمۡرَأَتَانِ مِمَّن تَرۡضَوۡنَ مِنَ ٱلشُّہَدَآءِ أَن تَضِلَّ إِحۡدَٮٰهُمَا فَتُذَڪِّرَ إِحۡدَٮٰهُمَا ٱلۡأُخۡرَىٰ‌ۚ وَلَا يَأۡبَ ٱلشُّہَدَآءُ إِذَا مَا دُعُواْ‌ۚ وَلَا تَسۡـَٔمُوٓاْ أَن تَكۡتُبُوهُ صَغِيرًا أَوۡ ڪَبِيرًا إِلَىٰٓ أَجَلِهِۦ‌ۚ ذَٲلِكُمۡ أَقۡسَطُ عِندَ ٱللَّهِ وَأَقۡوَمُ لِلشَّہَـٰدَةِ وَأَدۡنَىٰٓ أَلَّا تَرۡتَابُوٓاْ‌ۖ إِلَّآ أَن تَكُونَ تِجَـٰرَةً حَاضِرَةً۬ تُدِيرُونَهَا بَيۡنَڪُمۡ فَلَيۡسَ عَلَيۡكُمۡ جُنَاحٌ أَلَّا تَكۡتُبُوهَا‌ۗ وَأَشۡهِدُوٓاْ إِذَا تَبَايَعۡتُمۡ‌ۚ وَلَا يُضَآرَّ كَاتِبٌ۬ وَلَا شَهِيدٌ۬‌ۚ وَإِن تَفۡعَلُواْ فَإِنَّهُ ۥ فُسُوقُۢ بِڪُمۡ‌ۗ وَٱتَّقُواْ ٱللَّهَ‌ۖ وَيُعَلِّمُڪُمُ ٱللَّهُ‌ۗ وَٱللَّهُ بِڪُلِّ شَىۡءٍ عَلِيمٌ۬ وَإِن كُنتُمۡ عَلَىٰ سَفَرٍ۬ وَلَمۡ تَجِدُواْ كَاتِبً۬ا فَرِهَـٰنٌ۬ مَّقۡبُوضَةٌ۬‌ۖ فَإِنۡ أَمِنَ بَعۡضُكُم بَعۡضً۬ا فَلۡيُؤَدِّ ٱلَّذِى ٱؤۡتُمِنَ أَمَـٰنَتَهُ ۥ وَلۡيَتَّقِ ٱللَّهَ رَبَّهُ ۥ‌ۗ وَلَا تَكۡتُمُواْ ٱلشَّهَـٰدَةَ‌ۚ وَمَن يَڪۡتُمۡهَا فَإِنَّهُ ۥۤ ءَاثِمٌ۬ قَلۡبُهُ ۥ‌ۗ وَٱللَّهُ بِمَا تَعۡمَلُونَ عَلِيمٌ۬ لِّلَّهِ مَا فِى ٱلسَّمَـٰوَٲتِ وَمَا فِى ٱلۡأَرۡضِ‌ۗ وَإِن تُبۡدُواْ مَا فِىٓ أَنفُسِڪُمۡ أَوۡ تُخۡفُوهُ يُحَاسِبۡكُم بِهِ ٱللَّهُ‌ۖ فَيَغۡفِرُ لِمَن يَشَآءُ وَيُعَذِّبُ مَن يَشَآءُ‌ۗ وَٱللَّهُ عَلَىٰ ڪُلِّ شَىۡءٍ۬ قَدِيرٌ

"O ye who believe! when ye deal with each other, in transactions involving future obligations in a fixed period of time, reduce them to writing. Let a scribe write: down faithfully as between the parties: let not the scribe refuse to write as Allah has taught him, so let him write. Let him who incurs the liability dictate, but let him fear Allah, his Lord Allah and not diminish aught of what he owes. If the party liable is mentally deficient, or weak, or unable himself to dictate, let his guardian dictate faithfully. And get two witnesses, out of your own men And if there are not two men, then a man and two women, such as ye choose, for witnesses, so that if one of them errs, the other can remind her. The witnesses should not refuse when they are called on (for evidence). Disdain not to reduce to writing (your contract) for a future period, whether it be small or big: it is juster in the sight of Allah, more suitable as evidence, and more convenient to prevent doubts among yourselves; but if it be a transaction which ye carry out on the spot among yourselves, there is no blame on you if ye reduce it not to writing. But take witnesses whenever ye make a commercial contract; and let neither scribe nor witness suffer harm. If ye do (such harm) it would be wickedness in you. So fear Allah; for it is Allah that teaches you. And Allah is well acquainted with all things. If ye 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 ye do. To Allah belongeth all that is in the heavens and on earth. Whether ye show what is in your minds or conceal it, Allah calleth you to account for it. He forgiveth whom He pleaseth, and punisheth whom He pleaseth. For Allah hath power over all things."

(Qur'an: Baqarah: 2: 282-284)

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