Then he passed by another group of people whose private parts, from the front and behind, were wrapped in rags and they were grazing like camels and cattle. They were eating Daree'(a thorny plant of the fire of Jahannam) and Zaqqoom( a most bitter and foul smelling tree growing at the bottom of Jahannam) and the smouldering stones of Jahannam. Rasulullah(sallallahu alaiyhi wassallam) asked who these people were and Jibraeel (Alaihis salaam) replied, "They are those who do not discharge the zakaah of their wealth."