There are stories about Leviathan present in Jewish and Christian religions, as well as Middle Eastern mythology (via Learn Religions). It is a long-held and common belief that Leviathan was indeed a creation of God and could only be destroyed by him, says Mythology. In Jewish mythology, the story of Leviathan says that God slayed the female version of the creature, and fed it to starving Hebrew people. This is also recounted in the Bible, in Psalm 74:14. And in some mythology, the existence of Leviathan signified sin — envy, specifically, and perhaps even Satan himself, per Mythology.
While God created Leviathan, he also killed it. This is interpreted by many researchers that this means Leviathan was an enemy. It also aims to show that while God can create something as fearful to man as Leviathan, God can destroy it as well; leaving no doubt about his abilities to anyone, particularly Job.
