Al-Baqarah 2:273

Lilfuqara-i allatheena ohsiroofee sabeeli Allahi la yastateeAAoona darbanfee al-ardi yahsabuhumu aljahilu aghniyaamina attaAAaffufi taAArifuhum biseemahum layas-aloona annasa ilhafan wamatunfiqoo min khayrin fa-inna Allaha bihi AAaleem

[Charity is] for the poor who have been restricted for the cause of Allāh, unable to move about in the land. An ignorant [person] would think them self-sufficient because of their restraint, but you will know them by their [characteristic] sign. They do not ask people persistently [or at all]. And whatever you spend of good - indeed, Allāh is Knowing of it.

(Your charities should be preferably meant) for the needy who are confined in the way of Allah, unable to travel in the land.An ignorant person takes them as free of need because of their abstinence. You know them by their appearance (from begging). They do not beg people importunately, and whatever good thing you spend, Allah is All-Aware of it.