what is the rewarding for giving alms?

1. Who is he that will loan to Allah a beautiful loan, which Allah will double unto his credit and multiply many times? It is Allah that gives (you) Want or plenty, and to Him shall be your return.
(2:245)


2. The metaphor of those who spend their wealth in the Way of Allah is that of a grain which produces seven ears; in every ear there are a hundred grains. Allah gives such multiplied increase to whoever He wills. Allah is All-Encompassing, All-Knowing.
(2:261)

3. The metaphor of those who spend their wealth, desiring the pleasure of Allah and firmness for themselves, is that of a garden on a hillside. When heavy rain falls on it, it doubles its produce; and if heavy rain does not fall, there is dew. Allah sees what you do.
(2:265