سورة Al-Baqarah ( The Cow ) - الآية 273

(Charity is) for Fuqara (the poor), who in Allah's Cause are restricted (from travel), and cannot move about in the land (for trade or work). The one who knows them not, thinks that they are rich because of their modesty. You may know them by their mark, they do not beg of people at all. And whatever you spend in good, surely Allah knows it well.