Al-baqarah 264

O you who believe! Do not make your charity worthless by reproach and injury, like him who spends his property to be seen of men and does not believe in Allah and the Last Day; so his parable is as the parable of a smooth rock with earth on it. Then a heavy rain falls on it, so it leaves it bare; they shall not be able to gain anything of what they have earned; and Allah does not guide the unbelieving people.