O believers, do not nullify your charity by giving to oblige and flaunting (your favours) like a man who spends of his wealth only to show off, but does not believe in God and the Last Day. His semblance is that of a rock covered with earth which is washed away by rain exposing the hard rock bare. So they gain nothing from their earnings. God does not guide a people who do not believe.
— Quran 2:264