What does the Bible say about God's sovereignty in the plagues of Egypt?

In the story of the plagues in Egypt, we see a profound illustration of God's sovereignty. God repeatedly states His intention to harden Pharaoh's heart, indicating that it was not merely Pharaoh's actions that dictated the outcome, but God's sovereign decree. This perspective aligns with Romans 9:18, which says, 'Therefore hath he mercy on whom he will have mercy, and whom he will he hardeneth.' This sovereignty serves a dual purpose: to display His power and to execute judgment on those who reject Him while simultaneously delivering His chosen people, Israel. The events highlight that God's will prevails, and His plans cannot be thwarted by human opposition.