Charles Ellicott Commentary Exodus 10:28

"And Pharaoh said unto him, Get thee from me, take heed to thyself, see my face no more; for in the day thou seest my face thou shalt die." — Exodus 10:28 (ASV)

Get thee from me. —This address is rude, fierce, uncourteous. That a Pharaoh of the nineteenth (or eighteenth?) dynasty should have so spoken implies extreme and very uncommon excitement. Generally the Pharaohs of this polished period were as imperturbable as Chinese mandarins. We must suppose that until this time the king had persuaded himself that he would be able to bring Moses to a compromise, but that now at last he despaired of doing so; hence his anger and rudeness.

Thou shalt die. —Egyptian kings had the power of life and death, but rarely exercised it arbitrarily, or without trial. Very long and elaborate judicial processes have been found among the Egyptian remains. Still, no doubt, a monarch could put to death whomever he pleased; and so Egyptian courtiers were accustomed to acknowledge that they had lived to old age “by the favour of the king” (Brugsch, History of Egypt, vol. i., p. 92).