Those needy ones who are wholly wrapped up in the cause of Allah, and who are hindered from moving about the earth in search of their livelihood especially deserve help. He who is unaware of their circumstances supposes them to be wealthy because of their dignified bearing, but you will know them by their countenance, although they do not go about begging of people with importunity. And whatever wealth you will spend on helping them, Allah will know of it.
Narrated by: Abu Huraira
Allah's Apostle said, "Whoever is made wealthy by Allah and does not pay the Zakat of his wealth, then on the Day of Resurrection his wealth will be made like a bald-headed poisonous male snake with two black spots over the eyes. The snake will encircle his neck and bite his cheeks and say, 'I am your wealth, I am your treasure.' " Then the Prophet recited the holy verses:-- 'Let not those who withhold . . .' (to the end of the verse). (3.180).