Exodus 9:13-14

Then the LORD said to Moses, “Get up early in the morning and stand before Pharaoh and say to him, ‘Thus says the LORD, the God of the Hebrews, “Let My people go, so that they may serve Me. For this time I will send all My plagues on you [in full force,] and on your servants and on your people, so that you may know [without any doubt] and acknowledge that there is no one like Me in all the earth.