Exodus 9:14, 29

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.

Moses said to him, “As soon as I leave the city, I will stretch out my hands to the LORD; the thunder will cease and there will be no more hail, so that you may know [without any doubt] and acknowledge that the earth is the LORD’S.