John Gill Commentary Deuteronomy 1:8

"Behold, I have set the land before you: go in and possess the land which Jehovah sware unto your fathers, to Abraham, to Isaac, and to Jacob, to give unto them and to their seed after them." — Deuteronomy 1:8 (ASV)

Behold, I have set the land before you
Described it to them, and set its bounds, as well as had given them a grant of it:

go in and possess the land, which the Lord sware unto your fathers,
Abraham, Isaac, and Jacob, to give unto them and their seed after them :
and which being thus made sure unto them, they had nothing more to do than to go and take possession of it.