And I will make thee swear by the LORD, the God of heaven, and the God of the earth, that thou shalt not take a wife unto my son of the daughters of the Canaanites, among whom I dwell: I will make thee swear - See note on Genesis 24:9.
Of the Canaanites - Because these had already been devoted to slavery, etc., and it would have been utterly inconsistent as well with prudence as with the design of God to have united the child and heir of the promise with one who was under a curse, though that curse might be considered to be only of a political nature. See the curse of Canaan, Genesis 9:25 (note).