Exodus 5:1-2

21st Century King James Version

5 And afterward Moses and Aaron went in and told Pharaoh, “Thus saith the Lord God of Israel: ‘Let My people go, that they may hold a feast unto Me in the wilderness.’”

² 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.”