John Gill Commentary Exodus 11:10

"And Moses and Aaron did all these wonders before Pharaoh: and Jehovah hardened Pharaoh`s heart, and he did not let the children of Israel go out of his land." — Exodus 11:10 (ASV)

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.