Exodus 9:35
Pharaoh's heart was stubborn, and he did not let the Israelis go, just as the LORD had said through Moses.
Exodus 4:21
Then the LORD told Moses, "When you set out to return to Egypt, keep in mind all the wonders that I've put in your power, so that you may do them before Pharaoh. But I'll harden his heart so that he won't let the people go.
Treasury of Scripture Knowledge
Summary
And the heart of Pharaoh was hardened, neither would he let the children of Israel go; as the LORD had spoken by Moses.
General references
Bible References
General references
Jeremiah 34:11
But afterward they turned around and took back the male and female slaves that they had set free, and they forced them to become male and female slaves.