Quran Chapter 2 Verse 270-273
And whatever you spend of expenditures or make of vows – indeed, Allah knows of it. And for the wrongdoers there are no helpers.
If you disclose your charitable expenditures, they are good; but if you conceal them and give them to the poor, it is better for you, and He will remove from you some of your misdeeds [thereby]. And Allah , with what you do, is [fully] Acquainted.
Not upon you, [O Muhammad], is [responsibility for] their guidance, but Allah guides whom He wills. And whatever good you [believers] spend is for yourselves, and you do not spend except seeking the countenance of Allah . And whatever you spend of good – it will be fully repaid to you, and you will not be wronged.
[Charity is] for the poor who have been restricted for the cause of Allah , unable to move about in the land. An ignorant [person] would think them self-sufficient because of their restraint, but you will know them by their [characteristic] sign. They do not ask people persistently [or at all]. And whatever you spend of good – indeed, Allah is Knowing of it.