Exodus 9:35

that he refused to let the Israelites go. This was exactly what Jehovah said would happen.

Exodus 4:21

Jehovah said to Moses: When you go back to Egypt see that you perform before Pharaoh all the wonders that I have put in your power. I will harden his heart so that he will not 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
Later they changed their minds and took back the men and women they had freed and made them their slaves again.