John Gill 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)

And the Lord said unto him
The Word of the Lord, as the Jerusalem Targum, having shown him all the land of Canaan:

this [is] the land which I sware unto Abraham, unto Isaac, and unto
Jacob, saying, I will give it unto your seed ;
to Abraham, (Genesis 15:18) ; to Isaac, (Genesis 26:3) ; to Jacob, (Genesis 28:13) ;

I have caused you to see [it] with your eyes ;
not only had indulged him with a general view of it, but had strengthened his eyesight, that he had a full, clear, and distinct sight of it:

but thou shalt not go over thither ;
which he had said more than once before and abides by it, and this because of the behaviour of Moses at the waters of Meribah, (Numbers 20:12) ; see (Deuteronomy 3:25–27) .