What does Exodus 12:31 mean?
Pharaoh wastes no time after suffering the death of his own son (Exodus 4:21–23). Every household in Egypt is devastated by the loss of their firstborn (Exodus 11:4–6; 12:29–30). Although he had threatened Moses and Aaron (Exodus 10:28), Pharaoh calls for them in the middle of the night and grants the nation of Israel complete freedom (Exodus 5:1; 7:16; 8:1, 20; 9:1, 13; 10:3). He makes no attempt to negotiate. He has not submitted to God in any sort of faith—he is merely surrendering in the face of annihilation.Because he so often rejected chances to honor God (Exodus 7:3, 13, 14, 22; 8:19), Egypt's king is now beyond any chance of repentance (Exodus 10:1–2; Proverbs 29:1). This will be yet another temporary mood (Exodus 8:15, 31–32; 9:34–35; 10:19–20). Before long, he will change his mind and decide to pursue Israel (Exodus 14:5–8), resulting in the loss of his army (Exodus 14:23, 28) and most likely his own life.
Pharaoh is mentioned seven times in Deuteronomy (Deuteronomy 6:21, 22; 7:8, 18; 11:3; 29:2; 34:11), using what God's rescue and what He did to Pharaoh to give the nation of Israel confidence regarding taking the land across the Jordan river (Deuteronomy 29:2).