Exodus 11:10

And Moses and Aaron did all these wonders before Pharaoh,
&c,] Which are related in the preceding chapters: and the Lord hardened Pharaoh's heart:
one time after another, and yet more and more: so that he would not let the children of Israel go out of his land;
until the last plague, the slaying of the firstborn, was brought upon him and his people, related in the following chapter.