That which he hath greedily and industriously sucked in as pleasant and wholesome nourishment, shall in the issue be as ungrateful and destructive to him as the poison or head (for the Hebrew word signifies both, and the poison lies in the head) of asps would be to one that sucketh it. The viper's tongue, together with its teeth, in which the poison lurks, which it conveys by biting a man.
Related Commentaries of Job 20:16
Job 20:16
16 He shall suck the poison of asps: the viper's tongue shall slay him.