Exodus 7:4-6

New Revised Standard Version, Anglicised

⁴ When Pharaoh does not listen to you, I will lay my hand upon Egypt and bring my people the Israelites, company by company, out of the land of Egypt by great acts of judgement. ⁵ The Egyptians shall know that I am the Lord, when I stretch out my hand against Egypt and bring the Israelites out from among them.’ ⁶ Moses and Aaron did so; they did just as the Lord commanded them.