Here "heart" refers to Pharaoh. His stubborn attitude is spoken of as if his heart was hard. See how you translated this in [Exodus 4:21](../04/21.md). AT: "will cause Pharaoh to be stubborn" (See: [[rc://en/ta/man/translate/figs-synecdoche]] and [[rc://en/ta/man/translate/figs-metaphor]])
The words "signs" and "wonders" mean basically the same thing. God uses them to emphasize the greatness of what he will do in Egypt. (See: [[rc://en/ta/man/translate/figs-doublet]])
The words "my hand" represent God's great power. AT: "use my power against ... show my powerful acts against" (See: [[rc://en/ta/man/translate/figs-metonymy]])
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