What does the Bible say about pestilence and God's purpose?

The scripture reveals that pestilence is not a random occurrence, but rather a means by which God demonstrates His purpose in the world. For instance, God sent Moses to Pharaoh to declare His purpose for raising him up, explaining that He sent plagues so that Pharaoh might know there is none like Him (Exodus 9:14). Similarly, in Romans, Paul states that it is God who shows mercy and hardens hearts according to His sovereign will (Romans 9:15-18). Therefore, every pestilential event illustrates God's authority and ultimately serves to glorify His name.