Genesis 24:37
"And my master made me swear, saying, Thou shalt not take a wife to my son of the daughters of the Canaanites, in whose land I dwell:"
Cross References (ranked by relevance)
Genesis 27:46
And Rebekah said to Isaac, I am weary of my life because of the daughters of Heth: if Jacob take a wife of the daughters of Heth, such as these which are of the daughters of the land, what good shall my life do me?
Genesis 6:2
That the sons of God saw the daughters of men that they were fair; and they took them wives of all which they chose.