Exodus 5:1-2

MSB(i) 1 After that, Moses and Aaron went to Pharaoh and said, “This is what the LORD, the God of Israel, says: ‘Let My people go, so that they may hold a feast to Me in the wilderness.’” 2 But Pharaoh replied, “Who is the LORD that I should obey His voice and let Israel go? I do not know the LORD, and I will not let Israel go.”