Exodus 5:2-3

MSB(i) 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.” 3 “The God of the Hebrews has met with us,” they answered. “Please let us go on a three-day journey into the wilderness to sacrifice to the LORD our God, or He may strike us with plagues or with the sword.”