The Cow - 2:280 If (the debtor) is in hardship, wait until there is ease. It is better for you if you forgive the debt as gratuitous charity, if you only knew.
Unrequited aid and its consequences:
The Man/76:9 We feed you for the sake of Allah. We do not expect from you anything in return or thanks.
The Man/76:10 We fear from our Lord for a Day that will be a grim and troublesome Day.
The Man/76:11 Indeed, Allah protects them from the evil of that Day and gives them joy and gladness.