The tree of Zaqqum? Lo! We have appointed it a torment for wrong-doers. Lo! it is a tree that springeth in the heart of hell. Its crop is as it were the heads of devils. And lo! they verily must eat thereof, and fill (their) bellies therewith. And afterward, lo! thereupon they have a drink of boiling water. And afterward, lo! their return is surely unto hell. 37:62