Pharaoh will not listen to you. Then I will lay my hand on Egypt and bring my hosts, my people the children of Israel, out of the land of Egypt by great acts of judgment.
God made Moses a god to Pharaoh, His representative with divine authority to demand obedience and inflict plagues, and gave him Aaron as prophet to denounce those plagues. Though Pharaoh would not listen, God promised the work would be done: Israel would be freed and the Egyptians forced to know Him.
AI summary
Commenting on Exodus 7:1-7
But Pharaoh shall not hearken unto you,.... Regard not what they said, nor answer the demand they made, or obey the command of God delivered by them to him: this the Lord apprised them of, that they might not be discouraged, and conclude their labour would be in vain, their attempts fruitless, and they should never gain their point, but spend their time, and expose...
I may lay mine hand upon Egypt, &c.--The succession of terrible judgments with which the country was about to be scourged would fully demonstrate the supremacy of Israel's God.