Exodus 4:21

21And the Lord said to him, as he was returning to Egypt: “See that you accomplish, in the sight of Pharaoh, all the wonders that I have placed in your hand. I will harden his heart, and he will not release the people.
4:21 I shall harden, etc: Not by being the efficient cause of his sin; but by withdrawing from him, for his just punishment, the dew of grace that might have softened his heart; and so suffering him to grow harder and harder.(Challoner)
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