A true believer should always be kind-hearted and aimable to others and an act of goodness should not be done only to those who are good to us, but to such people, as well, who treat us unjustly.
An act of kindness is most pleasing to Allah, no matter to what kind or class it belongs or to whom it is done. To attend to the need of a poor and helpless man or woman and to take pains in order to bring relief to them is an act of such a high order, in the sight of Allah, that the believer who do so are worthy of the same reward that is on fighting in the way of Allah or devoting one's nights, habitually, to prayer and days to fasting.
It is related by Abu Hurayrah radiallahau anhu that the Messenger of Allah sallallahu alaihi wassallam said: "Whoe ever exert himself for the sake of a helpless widow or a weak and indigent man is equal in recompense to him how exerts himself in the path of Allah." (Bukhari and Muslim).
The Prophet sallallahu alaihi wassallam has mentioned these kind acts of fellow-feeling and kind treatment so that everyone should be ready to do what favour he can to others, no matter how insignificant it appeared.