http://www.radioislam.org.za/a/index.php/library/172-zakaah/11761-sadaqah-virtues-of-spending.html
Allah says in the Holy Quran,,,, (excerpts from fazail e sadaqat)
The likeness of those who spend their wealth in Allah’s way (for good deeds) is as the likeness of a grain which grows seven ears, in every ear a hundred grains. Allah gives manifold increase to whom He wills. Allah is AllEmbracing, and All-Knowing (He knows the motive for which wealth is spent). (al-baqarah: 261)
which means.....
Ahadith say that there are six categories of deeds and four categories of men. The six types of deeds include two that are obligatory and two bring equal compensation, the fifth one brings ten times reward and the sixth may bring seven hundred times reward in return. The obligatory two are that, if a person dies without committing any ‘Shirk’ he shall go to ‘Jannah’ and if he is guilty of ‘Shirk’ he shall land himself in ‘Jahannam’.
Those at equal compensation are; if a person intends to do a good deed but is unable to accomplish it, he shall receive a single virtue as a reward for making the good intention. Similarly, if a person commits a sin, his punishment shall correspond to a single sin. When a person actually accomplishes a single good deed, his reward shall be tenfold, whereas, if he spends for the cause of Allah, his return shall be seven hundred times the value of the wealth spent.
The four categories of men referred to are as follows:
(pics from GOODLE search)