Bereshis 24:3-4

And I will make thee swear by HASHEM Elohei HaShomayim and Elohei Ha'Aretz, that thou shalt not take an isha unto beni of the Banot HaKena'ani, among whom I dwell: But thou shalt go unto my eretz, and to my moledet, and take an isha unto beni Yitzchak.