What is the story of God changing Pharaoh's heart in the Bible?

According to the Bible, the Israelites were a group of people who were enslaved by the Egyptians for several years. God chose Moses to lead the Israelites out of Egypt and into the Promised Land. However, Pharaoh, the ruler of Egypt, refused to let the Israelites go, despite God's command to release them.

Moses went to Pharaoh several times to request the release of the Israelites, but Pharaoh remained stubborn and refused to let them go. In response, God sent a series of plagues to Egypt to punish Pharaoh and convince him to release the Israelites.

The plagues included turning the Nile River into blood, sending a swarm of locusts, causing darkness to cover the land, and sending a deadly epidemic. Despite these devastating plagues, Pharaoh continued to refuse to let the Israelites go.

Finally, after the tenth plague, which was the death of the firstborn in every Egyptian household, Pharaoh had a change of heart and released the Israelites from slavery. God had spared the Israelites from the final plague by commanding them to mark their doorposts with the blood of a lamb, a practice that is still observed by Jews today during Passover.