KJV: And Pharaoh said, Who is the LORD, that I should obey his voice to let Israel go? I know not the LORD, neither will I let Israel go.
NASB: But Pharaoh said, "Who is the LORD that I should obey His voice to let Israel go? I do not know the LORD, and besides, I will not let Israel go."
KJV: Then the LORD said unto Moses, Now shalt thou see what I will do to Pharaoh: for with a strong hand shall he let them go, and with a strong hand shall he drive them out of his land.
NASB: Then the LORD said to Moses, "Now you shall see what I will do to Pharaoh; for under compulsion he will let them go, and under compulsion he will drive them out of his land."