This passage shows the sovereign will of God as well as His tempered might. God could destroy Egypt at any time but will use this country to show His power to the other nations. God’s mercy is also apparent to those that heeded His warning and brought their servants and livestock in from the fields. Pharaoh would do the flip flop, first acknowledging God and then hardening his own heart and reneging on his promise to let the Israelites go.
2 Cor 4:1-12