These verses describe two of the plagues inflicted upon the Egyptians: a prolonged and terrifying darkness that afflicted only them, while the Israelites enjoyed light, emphasizing God's judgment and the Egyptians' fear and foolishness; and the death of the Egyptian firstborn, while the Israelites were spared, highlighting God's power and faithfulness in saving his people. The text also recounts the Israelites' subsequent journey, where nature itself is shown to respond to God's commands for their protection and provision, contrasting with the continued divine punishment of the Egyptians.