Rashi on Genesis 23:4/רש"י על בראשית כ״ג:ד׳

1גר ותושב אנכי עמכם I AM A STRANGER AND A SETTLER WITH YOU — A stranger having come from another land, but I have settled down amongst you. A Midrashic explanation is: if you agree to sell me the land then I will regard myself as a stranger and will pay for it, but if not, I shall claim it as a settler and will take it as my legal right, because the Holy One, blessed be He, said to me, (12:7) “Unto thy seed I give this land" (Genesis Rabbah 58:6).

2אחזת קבר A POSSESSION OF A BURYING PLACE — means possession of land to serve as a burying place.