The Terror of the Day of Judgement, The Command to be Patient and to refrain from being Hasty like Prophet Yunus(Job) was. (Job)Yunus bin Matta, when he went off angry with his people. Various things happened to him, such as riding on a ship at sea, being swallowed by a (large) fish, the fish carrying him off into the ocean, being in the darkness and depth of the sea and hearing the sea's and its dwellers glorification of the Most High, the Most Able (Allah).
