And I will make thee swear by the Lord, the God of heaven, and the God of earth,.... The Maker and possessor of heaven and earth, by whom Abraham used to swear whenever he did, and by whom only men should swear, see Ge 14:22.
The Targum of Jonathan is,"I will make thee swear by the name of the Word of the Lord God,''which strengthens the sense given of the rite before observed:that thou wilt not take a wife unto my son of the daughters of the Canaanites, among whom I dwell; these being not only idolaters, and very wicked people, degenerated yet more and more, but were the seed of the accursed Canaan; and who in process of time would be dispossessed of the land, and be destroyed.