O you who believe, do not nullify your acts of charity by boasting about (doing people a) favour and by causing (them) hurt, like the one who spends his wealth to show off before people and does not believe in Allah and in the Last Day. So, his example is like a rock on which there is dust, then a heavy rain came over it and left it barren. They have no ability to gain anything out of what they have done, and Allah does not give guidance to the people who disbelieve.