Final answer:
God sent a series of plagues upon Egypt to compel the Pharaoh to free the Hebrews, as recounted in the biblical story of the Exodus.
Step-by-step explanation:
When the ruler of Egypt refused to free the Hebrews, God sent a series of plagues. This event is a seminal part of the Biblical account of the Exodus, where ten catastrophic plagues are inflicted upon Egypt by the deity Yahweh to persuade Pharaoh to release the enslaved Israelites. Examples of these plagues include the Nile turning to blood, invasions of frogs and insects, livestock diseases, boils, hail, darkness, and ultimately, the death of the firstborn sons of Egypt.