On the day whereon God shall gather them all together . . . "O race of Djinn," will He say, "much did ye exact from mankind." And their votaries from among men shall say, "O our Lord! we rendered one another mutual services: but we have reached our set term, which thou hast set for us." He will say, "Your abode the fire! therein abide ye for ever: unless as God shall will." Verily, thy Lord is Wise, Knowing.