Genesis 24:3, 37

and I will make thee swear by Jehovah, the God of heaven and the God of the earth, that thou wilt not take a wife for my son of the daughters of the Canaanites, among whom I dwell

And my master made me swear, saying, Thou shalt not take a wife for my son of the daughters of the Canaanites, in whose land I dwell