Albert Barnes Commentary Deuteronomy 34:4

"And Jehovah said unto him, This is the land which I sware unto Abraham, unto Isaac, and unto Jacob, saying, I will give it unto thy seed: I have caused thee to see it with thine eyes, but thou shalt not go over thither." — Deuteronomy 34:4 (ASV)

I have caused you to see it - The sight thus granted to Moses, like that of all the kingdoms of the world in a moment of time (Luke 4:5), was no doubt supernatural.