(excerpts from fazail e sadaqat)
http://www.radioislam.org.za/a/index.php/resources/library/172-zakaah/11761-sadaqah-virtues-of-spending.htm
Allah says in Quran....
Allah has blighted usury and made alms-giving fruitful. (al Baqarah: 276)
which means....
We have already quoted many traditions about the fruitfulness of Sadaqah; these Ahadith say that the reward for Sadaqah goes on increasing till it becomes as big as a mountain.
Those rewards will accrue in the Akhirah, but even in this life the Sadaqah causes one’s income to grow. If a man gives away charities, sincerely and plentifully, his income goes on increasing. Let anyone try it, but sincerity is the condition; there must be no inkling of self-display or pride in spending. As regards usury, it is bound to be a bad bargain in the Akhirah, while here, too, usury brings ruination.
Abdullah bin Mas’ood Radhiallaho anho narrates that Rasulullah Sallallaho alaihe wasallam once said, "Even though usury may look productive, it leads to want and poverty in the end". Similarly Ma’mar Rahmatullah alaihe says that usury tends to decrease one’s wealth in forty years.
Hazrat Dhahaak Radhiallaho anho says that although usury increases in this world, it shall certainly lead to ruin in the Hereafter. Abu Barzah Radhiallaho anho narrates that Rasulullah Sallallaho alaihe wasallam said, "A man just gives a piece in charity and Allah Ta’ala grants it increase till it grows large in size like Mount Uhad".
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