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.”
Jewish Publication Society of America Version (JPS1917) - Exodus 5:2 >And Pharaoh said: 'Who is the LORD, that I should hearken unto His voice to let Israel go? I know not the LORD, and moreover I will not let Israel go.'